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Finding the Fourth Proportional to 12,780.99, 19,146.44 and 8,385.12

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Solution

The fourth proportional to 12,780.99, 19,146.44 and 8,385.12 is: 12,561.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.99 : 19,146.44 = 8,385.12 : x
  2. Step 2: Convert to fraction form
    12,780.99/19,146.44 = 8,385.12/x
  3. Step 3: Cross multiply
    12,780.99x = 19,146.44 × 8,385.12
  4. Step 4: Simplify right side
    12,780.99x = 160,545,217.94
  5. Step 5: Solve for x
    x = 160,545,217.94/12,780.99
  6. Step 6: Final answer
    x = 12,561.25

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Half scale
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Double scale
Find fourth proportional to 12,781.99, 19,147.94 and 8,386.12
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.