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Finding the Fourth Proportional to 1,109.71, 1,531.11 and 631.16

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Solution

The fourth proportional to 1,109.71, 1,531.11 and 631.16 is: 870.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.71 : 1,531.11 = 631.16 : x
  2. Step 2: Convert to fraction form
    1,109.71/1,531.11 = 631.16/x
  3. Step 3: Cross multiply
    1,109.71x = 1,531.11 × 631.16
  4. Step 4: Simplify right side
    1,109.71x = 966,375.39
  5. Step 5: Solve for x
    x = 966,375.39/1,109.71
  6. Step 6: Final answer
    x = 870.84

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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.