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Finding the Fourth Proportional to 399.20, 598.88 and 155.70

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Solution

The fourth proportional to 399.20, 598.88 and 155.70 is: 233.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.20 : 598.88 = 155.70 : x
  2. Step 2: Convert to fraction form
    399.20/598.88 = 155.70/x
  3. Step 3: Cross multiply
    399.20x = 598.88 × 155.70
  4. Step 4: Simplify right side
    399.20x = 93,246.01
  5. Step 5: Solve for x
    x = 93,246.01/399.20
  6. Step 6: Final answer
    x = 233.59

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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.