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Finding the Fourth Proportional to 766.20, 1,148.59 and 279.14

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Solution

The fourth proportional to 766.20, 1,148.59 and 279.14 is: 418.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.20 : 1,148.59 = 279.14 : x
  2. Step 2: Convert to fraction form
    766.20/1,148.59 = 279.14/x
  3. Step 3: Cross multiply
    766.20x = 1,148.59 × 279.14
  4. Step 4: Simplify right side
    766.20x = 320,617.41
  5. Step 5: Solve for x
    x = 320,617.41/766.20
  6. Step 6: Final answer
    x = 418.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.