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Finding the Fourth Proportional to 98,687.80, 148,031.70 and 65,445.40

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Solution

The fourth proportional to 98,687.80, 148,031.70 and 65,445.40 is: 98,168.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,687.80 : 148,031.70 = 65,445.40 : x
  2. Step 2: Convert to fraction form
    98,687.80/148,031.70 = 65,445.40/x
  3. Step 3: Cross multiply
    98,687.80x = 148,031.70 × 65,445.40
  4. Step 4: Simplify right side
    98,687.80x = 9,687,993,819.18
  5. Step 5: Solve for x
    x = 9,687,993,819.18/98,687.80
  6. Step 6: Final answer
    x = 98,168.10

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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.