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Finding the Fourth Proportional to 1,432.76, 2,148.80 and 611.42

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Solution

The fourth proportional to 1,432.76, 2,148.80 and 611.42 is: 916.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.76 : 2,148.80 = 611.42 : x
  2. Step 2: Convert to fraction form
    1,432.76/2,148.80 = 611.42/x
  3. Step 3: Cross multiply
    1,432.76x = 2,148.80 × 611.42
  4. Step 4: Simplify right side
    1,432.76x = 1,313,805.49
  5. Step 5: Solve for x
    x = 1,313,805.49/1,432.76
  6. Step 6: Final answer
    x = 916.98

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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.