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Finding the Fourth Proportional to 1,042.78, 1,438.97 and 577

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Solution

The fourth proportional to 1,042.78, 1,438.97 and 577 is: 796.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.78 : 1,438.97 = 577 : x
  2. Step 2: Convert to fraction form
    1,042.78/1,438.97 = 577/x
  3. Step 3: Cross multiply
    1,042.78x = 1,438.97 × 577
  4. Step 4: Simplify right side
    1,042.78x = 830,285.69
  5. Step 5: Solve for x
    x = 830,285.69/1,042.78
  6. Step 6: Final answer
    x = 796.22

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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.