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Finding the Fourth Proportional to 742.69, 1,111.60 and 558.82

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Solution

The fourth proportional to 742.69, 1,111.60 and 558.82 is: 836.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.69 : 1,111.60 = 558.82 : x
  2. Step 2: Convert to fraction form
    742.69/1,111.60 = 558.82/x
  3. Step 3: Cross multiply
    742.69x = 1,111.60 × 558.82
  4. Step 4: Simplify right side
    742.69x = 621,184.31
  5. Step 5: Solve for x
    x = 621,184.31/742.69
  6. Step 6: Final answer
    x = 836.40

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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.