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Finding the Fourth Proportional to 71,520.56, 98,701.74 and 39,689.72

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Solution

The fourth proportional to 71,520.56, 98,701.74 and 39,689.72 is: 54,773.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.56 : 98,701.74 = 39,689.72 : x
  2. Step 2: Convert to fraction form
    71,520.56/98,701.74 = 39,689.72/x
  3. Step 3: Cross multiply
    71,520.56x = 98,701.74 × 39,689.72
  4. Step 4: Simplify right side
    71,520.56x = 3,917,444,424.11
  5. Step 5: Solve for x
    x = 3,917,444,424.11/71,520.56
  6. Step 6: Final answer
    x = 54,773.68

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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.