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Finding the Fourth Proportional to 742.15, 1,112.42 and 558.96

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Solution

The fourth proportional to 742.15, 1,112.42 and 558.96 is: 837.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.15 : 1,112.42 = 558.96 : x
  2. Step 2: Convert to fraction form
    742.15/1,112.42 = 558.96/x
  3. Step 3: Cross multiply
    742.15x = 1,112.42 × 558.96
  4. Step 4: Simplify right side
    742.15x = 621,789.93
  5. Step 5: Solve for x
    x = 621,789.93/742.15
  6. Step 6: Final answer
    x = 837.82

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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.