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Finding the Fourth Proportional to 374.89, 562.39 and 128.11

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Solution

The fourth proportional to 374.89, 562.39 and 128.11 is: 192.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.89 : 562.39 = 128.11 : x
  2. Step 2: Convert to fraction form
    374.89/562.39 = 128.11/x
  3. Step 3: Cross multiply
    374.89x = 562.39 × 128.11
  4. Step 4: Simplify right side
    374.89x = 72,044.97
  5. Step 5: Solve for x
    x = 72,044.97/374.89
  6. Step 6: Final answer
    x = 192.18

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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.