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Finding the Fourth Proportional to 1,154.20, 1,592.48 and 781.84

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Solution

The fourth proportional to 1,154.20, 1,592.48 and 781.84 is: 1,078.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.20 : 1,592.48 = 781.84 : x
  2. Step 2: Convert to fraction form
    1,154.20/1,592.48 = 781.84/x
  3. Step 3: Cross multiply
    1,154.20x = 1,592.48 × 781.84
  4. Step 4: Simplify right side
    1,154.20x = 1,245,064.56
  5. Step 5: Solve for x
    x = 1,245,064.56/1,154.20
  6. Step 6: Final answer
    x = 1,078.73

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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.