Home / 1,129.20-1,558.22-631.88

Finding the Fourth Proportional to 1,129.20, 1,558.22 and 631.88

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Solution

The fourth proportional to 1,129.20, 1,558.22 and 631.88 is: 871.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.20 : 1,558.22 = 631.88 : x
  2. Step 2: Convert to fraction form
    1,129.20/1,558.22 = 631.88/x
  3. Step 3: Cross multiply
    1,129.20x = 1,558.22 × 631.88
  4. Step 4: Simplify right side
    1,129.20x = 984,608.05
  5. Step 5: Solve for x
    x = 984,608.05/1,129.20
  6. Step 6: Final answer
    x = 871.95

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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.