Home / 1,129.30-1,558.39-631.85

Finding the Fourth Proportional to 1,129.30, 1,558.39 and 631.85

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Solution

The fourth proportional to 1,129.30, 1,558.39 and 631.85 is: 871.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.30 : 1,558.39 = 631.85 : x
  2. Step 2: Convert to fraction form
    1,129.30/1,558.39 = 631.85/x
  3. Step 3: Cross multiply
    1,129.30x = 1,558.39 × 631.85
  4. Step 4: Simplify right side
    1,129.30x = 984,657.77
  5. Step 5: Solve for x
    x = 984,657.77/1,129.30
  6. Step 6: Final answer
    x = 871.92

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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.