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Finding the Fourth Proportional to 250.40, 375.61 and 85.80

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Solution

The fourth proportional to 250.40, 375.61 and 85.80 is: 128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.40 : 375.61 = 85.80 : x
  2. Step 2: Convert to fraction form
    250.40/375.61 = 85.80/x
  3. Step 3: Cross multiply
    250.40x = 375.61 × 85.80
  4. Step 4: Simplify right side
    250.40x = 32,227.12
  5. Step 5: Solve for x
    x = 32,227.12/250.40
  6. Step 6: Final answer
    x = 128.71

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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.