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Finding the Fourth Proportional to 90,654.88, 124,660.08 and 78,697.30

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Solution

The fourth proportional to 90,654.88, 124,660.08 and 78,697.30 is: 108,217.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,654.88 : 124,660.08 = 78,697.30 : x
  2. Step 2: Convert to fraction form
    90,654.88/124,660.08 = 78,697.30/x
  3. Step 3: Cross multiply
    90,654.88x = 124,660.08 × 78,697.30
  4. Step 4: Simplify right side
    90,654.88x = 9,810,411,713.78
  5. Step 5: Solve for x
    x = 9,810,411,713.78/90,654.88
  6. Step 6: Final answer
    x = 108,217.14

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1.5x scale

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.