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Finding the Fourth Proportional to 781.88, 1,173.07 and 547.86

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Solution

The fourth proportional to 781.88, 1,173.07 and 547.86 is: 821.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.88 : 1,173.07 = 547.86 : x
  2. Step 2: Convert to fraction form
    781.88/1,173.07 = 547.86/x
  3. Step 3: Cross multiply
    781.88x = 1,173.07 × 547.86
  4. Step 4: Simplify right side
    781.88x = 642,678.13
  5. Step 5: Solve for x
    x = 642,678.13/781.88
  6. Step 6: Final answer
    x = 821.97

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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.