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Finding the Fourth Proportional to 989.12, 1,482.80 and 663.76

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Solution

The fourth proportional to 989.12, 1,482.80 and 663.76 is: 995.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.12 : 1,482.80 = 663.76 : x
  2. Step 2: Convert to fraction form
    989.12/1,482.80 = 663.76/x
  3. Step 3: Cross multiply
    989.12x = 1,482.80 × 663.76
  4. Step 4: Simplify right side
    989.12x = 984,223.33
  5. Step 5: Solve for x
    x = 984,223.33/989.12
  6. Step 6: Final answer
    x = 995.05

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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.