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Finding the Fourth Proportional to 1,280.67, 1,766.96 and 721.10

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Solution

The fourth proportional to 1,280.67, 1,766.96 and 721.10 is: 994.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.67 : 1,766.96 = 721.10 : x
  2. Step 2: Convert to fraction form
    1,280.67/1,766.96 = 721.10/x
  3. Step 3: Cross multiply
    1,280.67x = 1,766.96 × 721.10
  4. Step 4: Simplify right side
    1,280.67x = 1,274,154.86
  5. Step 5: Solve for x
    x = 1,274,154.86/1,280.67
  6. Step 6: Final answer
    x = 994.92

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Double scale
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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.