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Finding the Fourth Proportional to 71,390, 98,520.36 and 39,555.92

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Solution

The fourth proportional to 71,390, 98,520.36 and 39,555.92 is: 54,588.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,390 : 98,520.36 = 39,555.92 : x
  2. Step 2: Convert to fraction form
    71,390/98,520.36 = 39,555.92/x
  3. Step 3: Cross multiply
    71,390x = 98,520.36 × 39,555.92
  4. Step 4: Simplify right side
    71,390x = 3,897,063,478.53
  5. Step 5: Solve for x
    x = 3,897,063,478.53/71,390
  6. Step 6: Final answer
    x = 54,588.37

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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.