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Finding the Fourth Proportional to 356.72, 535.20 and 140.42

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Solution

The fourth proportional to 356.72, 535.20 and 140.42 is: 210.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.72 : 535.20 = 140.42 : x
  2. Step 2: Convert to fraction form
    356.72/535.20 = 140.42/x
  3. Step 3: Cross multiply
    356.72x = 535.20 × 140.42
  4. Step 4: Simplify right side
    356.72x = 75,152.78
  5. Step 5: Solve for x
    x = 75,152.78/356.72
  6. Step 6: Final answer
    x = 210.68

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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.