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Finding the Fourth Proportional to 781.34, 1,170.84 and 318.56

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Solution

The fourth proportional to 781.34, 1,170.84 and 318.56 is: 477.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.34 : 1,170.84 = 318.56 : x
  2. Step 2: Convert to fraction form
    781.34/1,170.84 = 318.56/x
  3. Step 3: Cross multiply
    781.34x = 1,170.84 × 318.56
  4. Step 4: Simplify right side
    781.34x = 372,978.13
  5. Step 5: Solve for x
    x = 372,978.13/781.34
  6. Step 6: Final answer
    x = 477.36

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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.