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Finding the Fourth Proportional to 781.68, 1,077.76 and 633.92

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Solution

The fourth proportional to 781.68, 1,077.76 and 633.92 is: 874.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.68 : 1,077.76 = 633.92 : x
  2. Step 2: Convert to fraction form
    781.68/1,077.76 = 633.92/x
  3. Step 3: Cross multiply
    781.68x = 1,077.76 × 633.92
  4. Step 4: Simplify right side
    781.68x = 683,213.62
  5. Step 5: Solve for x
    x = 683,213.62/781.68
  6. Step 6: Final answer
    x = 874.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.