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Finding the Fourth Proportional to 773.40, 1,159.20 and 498.90

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Solution

The fourth proportional to 773.40, 1,159.20 and 498.90 is: 747.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.40 : 1,159.20 = 498.90 : x
  2. Step 2: Convert to fraction form
    773.40/1,159.20 = 498.90/x
  3. Step 3: Cross multiply
    773.40x = 1,159.20 × 498.90
  4. Step 4: Simplify right side
    773.40x = 578,324.88
  5. Step 5: Solve for x
    x = 578,324.88/773.40
  6. Step 6: Final answer
    x = 747.77

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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.