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Finding the Fourth Proportional to 66,305.72, 91,471.66 and 39,432.96

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Solution

The fourth proportional to 66,305.72, 91,471.66 and 39,432.96 is: 54,399.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,305.72 : 91,471.66 = 39,432.96 : x
  2. Step 2: Convert to fraction form
    66,305.72/91,471.66 = 39,432.96/x
  3. Step 3: Cross multiply
    66,305.72x = 91,471.66 × 39,432.96
  4. Step 4: Simplify right side
    66,305.72x = 3,606,998,309.91
  5. Step 5: Solve for x
    x = 3,606,998,309.91/66,305.72
  6. Step 6: Final answer
    x = 54,399.50

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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.