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Finding the Fourth Proportional to 1,009.78, 1,393.87 and 637.31

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Solution

The fourth proportional to 1,009.78, 1,393.87 and 637.31 is: 879.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.78 : 1,393.87 = 637.31 : x
  2. Step 2: Convert to fraction form
    1,009.78/1,393.87 = 637.31/x
  3. Step 3: Cross multiply
    1,009.78x = 1,393.87 × 637.31
  4. Step 4: Simplify right side
    1,009.78x = 888,321.47
  5. Step 5: Solve for x
    x = 888,321.47/1,009.78
  6. Step 6: Final answer
    x = 879.72

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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.