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Finding the Fourth Proportional to 721.04, 994.20 and 669.20

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Solution

The fourth proportional to 721.04, 994.20 and 669.20 is: 922.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.04 : 994.20 = 669.20 : x
  2. Step 2: Convert to fraction form
    721.04/994.20 = 669.20/x
  3. Step 3: Cross multiply
    721.04x = 994.20 × 669.20
  4. Step 4: Simplify right side
    721.04x = 665,318.64
  5. Step 5: Solve for x
    x = 665,318.64/721.04
  6. Step 6: Final answer
    x = 922.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.