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Finding the Fourth Proportional to 5,387.80, 8,081.70 and 1,491.88

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Solution

The fourth proportional to 5,387.80, 8,081.70 and 1,491.88 is: 2,237.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,387.80 : 8,081.70 = 1,491.88 : x
  2. Step 2: Convert to fraction form
    5,387.80/8,081.70 = 1,491.88/x
  3. Step 3: Cross multiply
    5,387.80x = 8,081.70 × 1,491.88
  4. Step 4: Simplify right side
    5,387.80x = 12,056,926.60
  5. Step 5: Solve for x
    x = 12,056,926.60/5,387.80
  6. Step 6: Final answer
    x = 2,237.82

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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.