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Finding the Fourth Proportional to 498.38, 750.56 and 421.85

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Solution

The fourth proportional to 498.38, 750.56 and 421.85 is: 635.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.38 : 750.56 = 421.85 : x
  2. Step 2: Convert to fraction form
    498.38/750.56 = 421.85/x
  3. Step 3: Cross multiply
    498.38x = 750.56 × 421.85
  4. Step 4: Simplify right side
    498.38x = 316,623.74
  5. Step 5: Solve for x
    x = 316,623.74/498.38
  6. Step 6: Final answer
    x = 635.31

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.