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Finding the Fourth Proportional to 932.90, 1,399.48 and 316.72

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Solution

The fourth proportional to 932.90, 1,399.48 and 316.72 is: 475.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.90 : 1,399.48 = 316.72 : x
  2. Step 2: Convert to fraction form
    932.90/1,399.48 = 316.72/x
  3. Step 3: Cross multiply
    932.90x = 1,399.48 × 316.72
  4. Step 4: Simplify right side
    932.90x = 443,243.31
  5. Step 5: Solve for x
    x = 443,243.31/932.90
  6. Step 6: Final answer
    x = 475.12

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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.