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Finding the Fourth Proportional to 1,663.70, 2,491.88 and 1,339.28

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Solution

The fourth proportional to 1,663.70, 2,491.88 and 1,339.28 is: 2,005.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.70 : 2,491.88 = 1,339.28 : x
  2. Step 2: Convert to fraction form
    1,663.70/2,491.88 = 1,339.28/x
  3. Step 3: Cross multiply
    1,663.70x = 2,491.88 × 1,339.28
  4. Step 4: Simplify right side
    1,663.70x = 3,337,325.05
  5. Step 5: Solve for x
    x = 3,337,325.05/1,663.70
  6. Step 6: Final answer
    x = 2,005.97

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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.