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Finding the Fourth Proportional to 399.28, 598.70 and 125.30

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Solution

The fourth proportional to 399.28, 598.70 and 125.30 is: 187.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.28 : 598.70 = 125.30 : x
  2. Step 2: Convert to fraction form
    399.28/598.70 = 125.30/x
  3. Step 3: Cross multiply
    399.28x = 598.70 × 125.30
  4. Step 4: Simplify right side
    399.28x = 75,014.12
  5. Step 5: Solve for x
    x = 75,014.12/399.28
  6. Step 6: Final answer
    x = 187.88

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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.