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Finding the Fourth Proportional to 755.01, 1,131.72 and 316.15

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Solution

The fourth proportional to 755.01, 1,131.72 and 316.15 is: 473.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.01 : 1,131.72 = 316.15 : x
  2. Step 2: Convert to fraction form
    755.01/1,131.72 = 316.15/x
  3. Step 3: Cross multiply
    755.01x = 1,131.72 × 316.15
  4. Step 4: Simplify right side
    755.01x = 357,789.26
  5. Step 5: Solve for x
    x = 357,789.26/755.01
  6. Step 6: Final answer
    x = 473.89

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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.