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Finding the Fourth Proportional to 766.63, 1,154.11 and 687.25

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Solution

The fourth proportional to 766.63, 1,154.11 and 687.25 is: 1,034.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.63 : 1,154.11 = 687.25 : x
  2. Step 2: Convert to fraction form
    766.63/1,154.11 = 687.25/x
  3. Step 3: Cross multiply
    766.63x = 1,154.11 × 687.25
  4. Step 4: Simplify right side
    766.63x = 793,162.10
  5. Step 5: Solve for x
    x = 793,162.10/766.63
  6. Step 6: Final answer
    x = 1,034.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.