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Finding the Fourth Proportional to 1,651.68, 2,279.19 and 1,211.43

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Solution

The fourth proportional to 1,651.68, 2,279.19 and 1,211.43 is: 1,671.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,651.68 : 2,279.19 = 1,211.43 : x
  2. Step 2: Convert to fraction form
    1,651.68/2,279.19 = 1,211.43/x
  3. Step 3: Cross multiply
    1,651.68x = 2,279.19 × 1,211.43
  4. Step 4: Simplify right side
    1,651.68x = 2,761,079.14
  5. Step 5: Solve for x
    x = 2,761,079.14/1,651.68
  6. Step 6: Final answer
    x = 1,671.68

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Double scale
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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.