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Finding the Fourth Proportional to 535.55, 738.98 and 311.42

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Solution

The fourth proportional to 535.55, 738.98 and 311.42 is: 429.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.55 : 738.98 = 311.42 : x
  2. Step 2: Convert to fraction form
    535.55/738.98 = 311.42/x
  3. Step 3: Cross multiply
    535.55x = 738.98 × 311.42
  4. Step 4: Simplify right side
    535.55x = 230,134.61
  5. Step 5: Solve for x
    x = 230,134.61/535.55
  6. Step 6: Final answer
    x = 429.72

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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.