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Finding the Fourth Proportional to 399.50, 598.90 and 155.97

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Solution

The fourth proportional to 399.50, 598.90 and 155.97 is: 233.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.50 : 598.90 = 155.97 : x
  2. Step 2: Convert to fraction form
    399.50/598.90 = 155.97/x
  3. Step 3: Cross multiply
    399.50x = 598.90 × 155.97
  4. Step 4: Simplify right side
    399.50x = 93,409.65
  5. Step 5: Solve for x
    x = 93,409.65/399.50
  6. Step 6: Final answer
    x = 233.82

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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.