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Finding the Fourth Proportional to 989.30, 1,480.87 and 729.60

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Solution

The fourth proportional to 989.30, 1,480.87 and 729.60 is: 1,092.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.30 : 1,480.87 = 729.60 : x
  2. Step 2: Convert to fraction form
    989.30/1,480.87 = 729.60/x
  3. Step 3: Cross multiply
    989.30x = 1,480.87 × 729.60
  4. Step 4: Simplify right side
    989.30x = 1,080,438.11
  5. Step 5: Solve for x
    x = 1,080,438.11/989.30
  6. Step 6: Final answer
    x = 1,092.12

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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.