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Finding the Fourth Proportional to 498.78, 747.30 and 315.75

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Solution

The fourth proportional to 498.78, 747.30 and 315.75 is: 473.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.78 : 747.30 = 315.75 : x
  2. Step 2: Convert to fraction form
    498.78/747.30 = 315.75/x
  3. Step 3: Cross multiply
    498.78x = 747.30 × 315.75
  4. Step 4: Simplify right side
    498.78x = 235,959.98
  5. Step 5: Solve for x
    x = 235,959.98/498.78
  6. Step 6: Final answer
    x = 473.07

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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.