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Finding the Fourth Proportional to 766.74, 1,154.65 and 690.60

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Solution

The fourth proportional to 766.74, 1,154.65 and 690.60 is: 1,039.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.74 : 1,154.65 = 690.60 : x
  2. Step 2: Convert to fraction form
    766.74/1,154.65 = 690.60/x
  3. Step 3: Cross multiply
    766.74x = 1,154.65 × 690.60
  4. Step 4: Simplify right side
    766.74x = 797,401.29
  5. Step 5: Solve for x
    x = 797,401.29/766.74
  6. Step 6: Final answer
    x = 1,039.99

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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.