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Finding the Fourth Proportional to 65,805.80, 98,579.10 and 39,432.20

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Solution

The fourth proportional to 65,805.80, 98,579.10 and 39,432.20 is: 59,070.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,805.80 : 98,579.10 = 39,432.20 : x
  2. Step 2: Convert to fraction form
    65,805.80/98,579.10 = 39,432.20/x
  3. Step 3: Cross multiply
    65,805.80x = 98,579.10 × 39,432.20
  4. Step 4: Simplify right side
    65,805.80x = 3,887,190,787.02
  5. Step 5: Solve for x
    x = 3,887,190,787.02/65,805.80
  6. Step 6: Final answer
    x = 59,070.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.