Home / 1,129.22-1,558.14-631.78

Finding the Fourth Proportional to 1,129.22, 1,558.14 and 631.78

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Solution

The fourth proportional to 1,129.22, 1,558.14 and 631.78 is: 871.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.22 : 1,558.14 = 631.78 : x
  2. Step 2: Convert to fraction form
    1,129.22/1,558.14 = 631.78/x
  3. Step 3: Cross multiply
    1,129.22x = 1,558.14 × 631.78
  4. Step 4: Simplify right side
    1,129.22x = 984,401.69
  5. Step 5: Solve for x
    x = 984,401.69/1,129.22
  6. Step 6: Final answer
    x = 871.75

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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.