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Finding the Fourth Proportional to 993.60, 1,487.57 and 660.56

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Solution

The fourth proportional to 993.60, 1,487.57 and 660.56 is: 988.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.60 : 1,487.57 = 660.56 : x
  2. Step 2: Convert to fraction form
    993.60/1,487.57 = 660.56/x
  3. Step 3: Cross multiply
    993.60x = 1,487.57 × 660.56
  4. Step 4: Simplify right side
    993.60x = 982,618.50
  5. Step 5: Solve for x
    x = 982,618.50/993.60
  6. Step 6: Final answer
    x = 988.95

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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.