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Finding the Fourth Proportional to 1,167.08, 1,611.28 and 725.20

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Solution

The fourth proportional to 1,167.08, 1,611.28 and 725.20 is: 1,001.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.08 : 1,611.28 = 725.20 : x
  2. Step 2: Convert to fraction form
    1,167.08/1,611.28 = 725.20/x
  3. Step 3: Cross multiply
    1,167.08x = 1,611.28 × 725.20
  4. Step 4: Simplify right side
    1,167.08x = 1,168,500.26
  5. Step 5: Solve for x
    x = 1,168,500.26/1,167.08
  6. Step 6: Final answer
    x = 1,001.22

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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.