Home / 1,279.38-1,761.18-947.18

Finding the Fourth Proportional to 1,279.38, 1,761.18 and 947.18

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Solution

The fourth proportional to 1,279.38, 1,761.18 and 947.18 is: 1,303.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.38 : 1,761.18 = 947.18 : x
  2. Step 2: Convert to fraction form
    1,279.38/1,761.18 = 947.18/x
  3. Step 3: Cross multiply
    1,279.38x = 1,761.18 × 947.18
  4. Step 4: Simplify right side
    1,279.38x = 1,668,145.67
  5. Step 5: Solve for x
    x = 1,668,145.67/1,279.38
  6. Step 6: Final answer
    x = 1,303.87

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1.5x scale

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.