Home / 1,279.76-1,764.98-1,031

Finding the Fourth Proportional to 1,279.76, 1,764.98 and 1,031

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Solution

The fourth proportional to 1,279.76, 1,764.98 and 1,031 is: 1,421.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.76 : 1,764.98 = 1,031 : x
  2. Step 2: Convert to fraction form
    1,279.76/1,764.98 = 1,031/x
  3. Step 3: Cross multiply
    1,279.76x = 1,764.98 × 1,031
  4. Step 4: Simplify right side
    1,279.76x = 1,819,694.38
  5. Step 5: Solve for x
    x = 1,819,694.38/1,279.76
  6. Step 6: Final answer
    x = 1,421.90

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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.