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Finding the Fourth Proportional to 989.03, 1,484.24 and 660.40

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Solution

The fourth proportional to 989.03, 1,484.24 and 660.40 is: 991.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.03 : 1,484.24 = 660.40 : x
  2. Step 2: Convert to fraction form
    989.03/1,484.24 = 660.40/x
  3. Step 3: Cross multiply
    989.03x = 1,484.24 × 660.40
  4. Step 4: Simplify right side
    989.03x = 980,185.08
  5. Step 5: Solve for x
    x = 980,185.08/989.03
  6. Step 6: Final answer
    x = 991.05

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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.