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Finding the Fourth Proportional to 842.40, 1,161.99 and 547.61

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Solution

The fourth proportional to 842.40, 1,161.99 and 547.61 is: 755.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.40 : 1,161.99 = 547.61 : x
  2. Step 2: Convert to fraction form
    842.40/1,161.99 = 547.61/x
  3. Step 3: Cross multiply
    842.40x = 1,161.99 × 547.61
  4. Step 4: Simplify right side
    842.40x = 636,311.53
  5. Step 5: Solve for x
    x = 636,311.53/842.40
  6. Step 6: Final answer
    x = 755.36

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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.