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Finding the Fourth Proportional to 85,387.97, 128,079.23 and 38,640.85

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Solution

The fourth proportional to 85,387.97, 128,079.23 and 38,640.85 is: 57,960.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,387.97 : 128,079.23 = 38,640.85 : x
  2. Step 2: Convert to fraction form
    85,387.97/128,079.23 = 38,640.85/x
  3. Step 3: Cross multiply
    85,387.97x = 128,079.23 × 38,640.85
  4. Step 4: Simplify right side
    85,387.97x = 4,949,089,801.14
  5. Step 5: Solve for x
    x = 4,949,089,801.14/85,387.97
  6. Step 6: Final answer
    x = 57,960.03

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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.