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Finding the Fourth Proportional to 100,915.20, 151,372.80 and 77,295.60

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Solution

The fourth proportional to 100,915.20, 151,372.80 and 77,295.60 is: 115,943.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,915.20 : 151,372.80 = 77,295.60 : x
  2. Step 2: Convert to fraction form
    100,915.20/151,372.80 = 77,295.60/x
  3. Step 3: Cross multiply
    100,915.20x = 151,372.80 × 77,295.60
  4. Step 4: Simplify right side
    100,915.20x = 11,700,451,399.68
  5. Step 5: Solve for x
    x = 11,700,451,399.68/100,915.20
  6. Step 6: Final answer
    x = 115,943.40

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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.