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Finding the Fourth Proportional to 14,845.70, 20,487.40 and 8,472.17

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Solution

The fourth proportional to 14,845.70, 20,487.40 and 8,472.17 is: 11,691.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,845.70 : 20,487.40 = 8,472.17 : x
  2. Step 2: Convert to fraction form
    14,845.70/20,487.40 = 8,472.17/x
  3. Step 3: Cross multiply
    14,845.70x = 20,487.40 × 8,472.17
  4. Step 4: Simplify right side
    14,845.70x = 173,572,633.22
  5. Step 5: Solve for x
    x = 173,572,633.22/14,845.70
  6. Step 6: Final answer
    x = 11,691.78

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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.