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Finding the Fourth Proportional to 71,460.60, 98,621.69 and 39,639.75

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Solution

The fourth proportional to 71,460.60, 98,621.69 and 39,639.75 is: 54,706.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,460.60 : 98,621.69 = 39,639.75 : x
  2. Step 2: Convert to fraction form
    71,460.60/98,621.69 = 39,639.75/x
  3. Step 3: Cross multiply
    71,460.60x = 98,621.69 × 39,639.75
  4. Step 4: Simplify right side
    71,460.60x = 3,909,338,937.98
  5. Step 5: Solve for x
    x = 3,909,338,937.98/71,460.60
  6. Step 6: Final answer
    x = 54,706.21

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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.