Home / 1,129.07-1,558.12-631.71

Finding the Fourth Proportional to 1,129.07, 1,558.12 and 631.71

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Solution

The fourth proportional to 1,129.07, 1,558.12 and 631.71 is: 871.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.07 : 1,558.12 = 631.71 : x
  2. Step 2: Convert to fraction form
    1,129.07/1,558.12 = 631.71/x
  3. Step 3: Cross multiply
    1,129.07x = 1,558.12 × 631.71
  4. Step 4: Simplify right side
    1,129.07x = 984,279.99
  5. Step 5: Solve for x
    x = 984,279.99/1,129.07
  6. Step 6: Final answer
    x = 871.77

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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.