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Finding the Fourth Proportional to 399.38, 599.15 and 155.92

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Solution

The fourth proportional to 399.38, 599.15 and 155.92 is: 233.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 599.15 = 155.92 : x
  2. Step 2: Convert to fraction form
    399.38/599.15 = 155.92/x
  3. Step 3: Cross multiply
    399.38x = 599.15 × 155.92
  4. Step 4: Simplify right side
    399.38x = 93,417.19
  5. Step 5: Solve for x
    x = 93,417.19/399.38
  6. Step 6: Final answer
    x = 233.91

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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.