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Finding the Fourth Proportional to 1,109.98, 1,531.60 and 631.39

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Solution

The fourth proportional to 1,109.98, 1,531.60 and 631.39 is: 871.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.98 : 1,531.60 = 631.39 : x
  2. Step 2: Convert to fraction form
    1,109.98/1,531.60 = 631.39/x
  3. Step 3: Cross multiply
    1,109.98x = 1,531.60 × 631.39
  4. Step 4: Simplify right side
    1,109.98x = 967,033.88
  5. Step 5: Solve for x
    x = 967,033.88/1,109.98
  6. Step 6: Final answer
    x = 871.22

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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.