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Finding the Fourth Proportional to 3,139.66, 4,702.66 and 1,491.21

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Solution

The fourth proportional to 3,139.66, 4,702.66 and 1,491.21 is: 2,233.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.66 : 4,702.66 = 1,491.21 : x
  2. Step 2: Convert to fraction form
    3,139.66/4,702.66 = 1,491.21/x
  3. Step 3: Cross multiply
    3,139.66x = 4,702.66 × 1,491.21
  4. Step 4: Simplify right side
    3,139.66x = 7,012,649.89
  5. Step 5: Solve for x
    x = 7,012,649.89/3,139.66
  6. Step 6: Final answer
    x = 2,233.57

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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.