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Finding the Fourth Proportional to 14,415.32, 19,894.42 and 8,128.92

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Solution

The fourth proportional to 14,415.32, 19,894.42 and 8,128.92 is: 11,218.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,415.32 : 19,894.42 = 8,128.92 : x
  2. Step 2: Convert to fraction form
    14,415.32/19,894.42 = 8,128.92/x
  3. Step 3: Cross multiply
    14,415.32x = 19,894.42 × 8,128.92
  4. Step 4: Simplify right side
    14,415.32x = 161,720,148.63
  5. Step 5: Solve for x
    x = 161,720,148.63/14,415.32
  6. Step 6: Final answer
    x = 11,218.63

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Half scale
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Double scale
Find fourth proportional to 14,416.32, 19,895.80 and 8,129.92
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.