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Finding the Fourth Proportional to 1,280.91, 1,767.14 and 808.64

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Solution

The fourth proportional to 1,280.91, 1,767.14 and 808.64 is: 1,115.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.91 : 1,767.14 = 808.64 : x
  2. Step 2: Convert to fraction form
    1,280.91/1,767.14 = 808.64/x
  3. Step 3: Cross multiply
    1,280.91x = 1,767.14 × 808.64
  4. Step 4: Simplify right side
    1,280.91x = 1,428,967.21
  5. Step 5: Solve for x
    x = 1,428,967.21/1,280.91
  6. Step 6: Final answer
    x = 1,115.59

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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.