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Finding the Fourth Proportional to 987.85, 1,479.21 and 662.23

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Solution

The fourth proportional to 987.85, 1,479.21 and 662.23 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.85 : 1,479.21 = 662.23 : x
  2. Step 2: Convert to fraction form
    987.85/1,479.21 = 662.23/x
  3. Step 3: Cross multiply
    987.85x = 1,479.21 × 662.23
  4. Step 4: Simplify right side
    987.85x = 979,577.24
  5. Step 5: Solve for x
    x = 979,577.24/987.85
  6. Step 6: Final answer
    x = 991.63

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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.