Home / 1,132.12-1,698.78-721.45

Finding the Fourth Proportional to 1,132.12, 1,698.78 and 721.45

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Solution

The fourth proportional to 1,132.12, 1,698.78 and 721.45 is: 1,082.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.12 : 1,698.78 = 721.45 : x
  2. Step 2: Convert to fraction form
    1,132.12/1,698.78 = 721.45/x
  3. Step 3: Cross multiply
    1,132.12x = 1,698.78 × 721.45
  4. Step 4: Simplify right side
    1,132.12x = 1,225,584.83
  5. Step 5: Solve for x
    x = 1,225,584.83/1,132.12
  6. Step 6: Final answer
    x = 1,082.56

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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.