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Finding the Fourth Proportional to 12,818.80, 17,678.90 and 8,340.92

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Solution

The fourth proportional to 12,818.80, 17,678.90 and 8,340.92 is: 11,503.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,818.80 : 17,678.90 = 8,340.92 : x
  2. Step 2: Convert to fraction form
    12,818.80/17,678.90 = 8,340.92/x
  3. Step 3: Cross multiply
    12,818.80x = 17,678.90 × 8,340.92
  4. Step 4: Simplify right side
    12,818.80x = 147,458,290.59
  5. Step 5: Solve for x
    x = 147,458,290.59/12,818.80
  6. Step 6: Final answer
    x = 11,503.28

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Half scale
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Double scale
Find fourth proportional to 12,819.80, 17,680.28 and 8,341.92
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.