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Finding the Fourth Proportional to 499.78, 748.77 and 316.72

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Solution

The fourth proportional to 499.78, 748.77 and 316.72 is: 474.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.78 : 748.77 = 316.72 : x
  2. Step 2: Convert to fraction form
    499.78/748.77 = 316.72/x
  3. Step 3: Cross multiply
    499.78x = 748.77 × 316.72
  4. Step 4: Simplify right side
    499.78x = 237,150.43
  5. Step 5: Solve for x
    x = 237,150.43/499.78
  6. Step 6: Final answer
    x = 474.51

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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.