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Finding the Fourth Proportional to 100,878.70, 151,318.05 and 85,132.30

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Solution

The fourth proportional to 100,878.70, 151,318.05 and 85,132.30 is: 127,698.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,878.70 : 151,318.05 = 85,132.30 : x
  2. Step 2: Convert to fraction form
    100,878.70/151,318.05 = 85,132.30/x
  3. Step 3: Cross multiply
    100,878.70x = 151,318.05 × 85,132.30
  4. Step 4: Simplify right side
    100,878.70x = 12,882,053,628.02
  5. Step 5: Solve for x
    x = 12,882,053,628.02/100,878.70
  6. Step 6: Final answer
    x = 127,698.45

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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.