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Finding the Fourth Proportional to 1,432.70, 2,149.20 and 611.06

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Solution

The fourth proportional to 1,432.70, 2,149.20 and 611.06 is: 916.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.70 : 2,149.20 = 611.06 : x
  2. Step 2: Convert to fraction form
    1,432.70/2,149.20 = 611.06/x
  3. Step 3: Cross multiply
    1,432.70x = 2,149.20 × 611.06
  4. Step 4: Simplify right side
    1,432.70x = 1,313,290.15
  5. Step 5: Solve for x
    x = 1,313,290.15/1,432.70
  6. Step 6: Final answer
    x = 916.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.