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Finding the Fourth Proportional to 742.77, 1,111.89 and 577.92

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Solution

The fourth proportional to 742.77, 1,111.89 and 577.92 is: 865.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.77 : 1,111.89 = 577.92 : x
  2. Step 2: Convert to fraction form
    742.77/1,111.89 = 577.92/x
  3. Step 3: Cross multiply
    742.77x = 1,111.89 × 577.92
  4. Step 4: Simplify right side
    742.77x = 642,583.47
  5. Step 5: Solve for x
    x = 642,583.47/742.77
  6. Step 6: Final answer
    x = 865.12

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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.