Home / 1,129.16-1,558.26-631.79

Finding the Fourth Proportional to 1,129.16, 1,558.26 and 631.79

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Solution

The fourth proportional to 1,129.16, 1,558.26 and 631.79 is: 871.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.16 : 1,558.26 = 631.79 : x
  2. Step 2: Convert to fraction form
    1,129.16/1,558.26 = 631.79/x
  3. Step 3: Cross multiply
    1,129.16x = 1,558.26 × 631.79
  4. Step 4: Simplify right side
    1,129.16x = 984,493.09
  5. Step 5: Solve for x
    x = 984,493.09/1,129.16
  6. Step 6: Final answer
    x = 871.88

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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.