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Finding the Fourth Proportional to 1,327.62, 1,989.90 and 660.18

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Solution

The fourth proportional to 1,327.62, 1,989.90 and 660.18 is: 989.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.62 : 1,989.90 = 660.18 : x
  2. Step 2: Convert to fraction form
    1,327.62/1,989.90 = 660.18/x
  3. Step 3: Cross multiply
    1,327.62x = 1,989.90 × 660.18
  4. Step 4: Simplify right side
    1,327.62x = 1,313,692.18
  5. Step 5: Solve for x
    x = 1,313,692.18/1,327.62
  6. Step 6: Final answer
    x = 989.51

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1.5x scale

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.