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Finding the Fourth Proportional to 15,142.92, 20,897.34 and 8,428.83

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Solution

The fourth proportional to 15,142.92, 20,897.34 and 8,428.83 is: 11,631.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,142.92 : 20,897.34 = 8,428.83 : x
  2. Step 2: Convert to fraction form
    15,142.92/20,897.34 = 8,428.83/x
  3. Step 3: Cross multiply
    15,142.92x = 20,897.34 × 8,428.83
  4. Step 4: Simplify right side
    15,142.92x = 176,140,126.31
  5. Step 5: Solve for x
    x = 176,140,126.31/15,142.92
  6. Step 6: Final answer
    x = 11,631.85

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Half scale
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Double scale
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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.