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Finding the Fourth Proportional to 1,147.32, 1,722.60 and 781.20

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Solution

The fourth proportional to 1,147.32, 1,722.60 and 781.20 is: 1,172.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.32 : 1,722.60 = 781.20 : x
  2. Step 2: Convert to fraction form
    1,147.32/1,722.60 = 781.20/x
  3. Step 3: Cross multiply
    1,147.32x = 1,722.60 × 781.20
  4. Step 4: Simplify right side
    1,147.32x = 1,345,695.12
  5. Step 5: Solve for x
    x = 1,345,695.12/1,147.32
  6. Step 6: Final answer
    x = 1,172.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.