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Finding the Fourth Proportional to 1,042.78, 1,437.69 and 865.09

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Solution

The fourth proportional to 1,042.78, 1,437.69 and 865.09 is: 1,192.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.78 : 1,437.69 = 865.09 : x
  2. Step 2: Convert to fraction form
    1,042.78/1,437.69 = 865.09/x
  3. Step 3: Cross multiply
    1,042.78x = 1,437.69 × 865.09
  4. Step 4: Simplify right side
    1,042.78x = 1,243,731.24
  5. Step 5: Solve for x
    x = 1,243,731.24/1,042.78
  6. Step 6: Final answer
    x = 1,192.71

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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.