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Finding the Fourth Proportional to 100,979.80, 151,469.70 and 65,728.60

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Solution

The fourth proportional to 100,979.80, 151,469.70 and 65,728.60 is: 98,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.80 : 151,469.70 = 65,728.60 : x
  2. Step 2: Convert to fraction form
    100,979.80/151,469.70 = 65,728.60/x
  3. Step 3: Cross multiply
    100,979.80x = 151,469.70 × 65,728.60
  4. Step 4: Simplify right side
    100,979.80x = 9,955,891,323.42
  5. Step 5: Solve for x
    x = 9,955,891,323.42/100,979.80
  6. Step 6: Final answer
    x = 98,592.90

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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.