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Finding the Fourth Proportional to 66,431.92, 91,605.72 and 42,559.60

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Solution

The fourth proportional to 66,431.92, 91,605.72 and 42,559.60 is: 58,687.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,431.92 : 91,605.72 = 42,559.60 : x
  2. Step 2: Convert to fraction form
    66,431.92/91,605.72 = 42,559.60/x
  3. Step 3: Cross multiply
    66,431.92x = 91,605.72 × 42,559.60
  4. Step 4: Simplify right side
    66,431.92x = 3,898,702,800.91
  5. Step 5: Solve for x
    x = 3,898,702,800.91/66,431.92
  6. Step 6: Final answer
    x = 58,687.19

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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.