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Finding the Fourth Proportional to 374.18, 516.57 and 257.90

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Solution

The fourth proportional to 374.18, 516.57 and 257.90 is: 356.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.18 : 516.57 = 257.90 : x
  2. Step 2: Convert to fraction form
    374.18/516.57 = 257.90/x
  3. Step 3: Cross multiply
    374.18x = 516.57 × 257.90
  4. Step 4: Simplify right side
    374.18x = 133,223.40
  5. Step 5: Solve for x
    x = 133,223.40/374.18
  6. Step 6: Final answer
    x = 356.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.