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Finding the Fourth Proportional to 1,280.18, 1,766.42 and 808.66

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Solution

The fourth proportional to 1,280.18, 1,766.42 and 808.66 is: 1,115.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.18 : 1,766.42 = 808.66 : x
  2. Step 2: Convert to fraction form
    1,280.18/1,766.42 = 808.66/x
  3. Step 3: Cross multiply
    1,280.18x = 1,766.42 × 808.66
  4. Step 4: Simplify right side
    1,280.18x = 1,428,434.39
  5. Step 5: Solve for x
    x = 1,428,434.39/1,280.18
  6. Step 6: Final answer
    x = 1,115.81

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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.