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Finding the Fourth Proportional to 781.17, 1,171.75 and 539.23

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Solution

The fourth proportional to 781.17, 1,171.75 and 539.23 is: 808.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.17 : 1,171.75 = 539.23 : x
  2. Step 2: Convert to fraction form
    781.17/1,171.75 = 539.23/x
  3. Step 3: Cross multiply
    781.17x = 1,171.75 × 539.23
  4. Step 4: Simplify right side
    781.17x = 631,847.25
  5. Step 5: Solve for x
    x = 631,847.25/781.17
  6. Step 6: Final answer
    x = 808.85

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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.