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Finding the Fourth Proportional to 1,079.37, 1,489.65 and 631.41

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Solution

The fourth proportional to 1,079.37, 1,489.65 and 631.41 is: 871.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.37 : 1,489.65 = 631.41 : x
  2. Step 2: Convert to fraction form
    1,079.37/1,489.65 = 631.41/x
  3. Step 3: Cross multiply
    1,079.37x = 1,489.65 × 631.41
  4. Step 4: Simplify right side
    1,079.37x = 940,579.91
  5. Step 5: Solve for x
    x = 940,579.91/1,079.37
  6. Step 6: Final answer
    x = 871.42

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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.