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Finding the Fourth Proportional to 80,997.30, 121,301.55 and 65,445.30

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Solution

The fourth proportional to 80,997.30, 121,301.55 and 65,445.30 is: 98,010.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,997.30 : 121,301.55 = 65,445.30 : x
  2. Step 2: Convert to fraction form
    80,997.30/121,301.55 = 65,445.30/x
  3. Step 3: Cross multiply
    80,997.30x = 121,301.55 × 65,445.30
  4. Step 4: Simplify right side
    80,997.30x = 7,938,616,330.22
  5. Step 5: Solve for x
    x = 7,938,616,330.22/80,997.30
  6. Step 6: Final answer
    x = 98,010.88

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1.5x scale

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.