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Finding the Fourth Proportional to 71,839.31, 98,420.32 and 69,145.75

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Solution

The fourth proportional to 71,839.31, 98,420.32 and 69,145.75 is: 94,730.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,839.31 : 98,420.32 = 69,145.75 : x
  2. Step 2: Convert to fraction form
    71,839.31/98,420.32 = 69,145.75/x
  3. Step 3: Cross multiply
    71,839.31x = 98,420.32 × 69,145.75
  4. Step 4: Simplify right side
    71,839.31x = 6,805,346,662.15
  5. Step 5: Solve for x
    x = 6,805,346,662.15/71,839.31
  6. Step 6: Final answer
    x = 94,730.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.