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Finding the Fourth Proportional to 56,861.92, 85,293.04 and 19,917.28

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Solution

The fourth proportional to 56,861.92, 85,293.04 and 19,917.28 is: 29,875.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,861.92 : 85,293.04 = 19,917.28 : x
  2. Step 2: Convert to fraction form
    56,861.92/85,293.04 = 19,917.28/x
  3. Step 3: Cross multiply
    56,861.92x = 85,293.04 × 19,917.28
  4. Step 4: Simplify right side
    56,861.92x = 1,698,805,359.73
  5. Step 5: Solve for x
    x = 1,698,805,359.73/56,861.92
  6. Step 6: Final answer
    x = 29,875.98

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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.