Home / 1,225.20-1,687.44-1,132.80

Finding the Fourth Proportional to 1,225.20, 1,687.44 and 1,132.80

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Solution

The fourth proportional to 1,225.20, 1,687.44 and 1,132.80 is: 1,560.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.20 : 1,687.44 = 1,132.80 : x
  2. Step 2: Convert to fraction form
    1,225.20/1,687.44 = 1,132.80/x
  3. Step 3: Cross multiply
    1,225.20x = 1,687.44 × 1,132.80
  4. Step 4: Simplify right side
    1,225.20x = 1,911,532.03
  5. Step 5: Solve for x
    x = 1,911,532.03/1,225.20
  6. Step 6: Final answer
    x = 1,560.18

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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.