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Finding the Fourth Proportional to 765.99, 1,149.18 and 279.45

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Solution

The fourth proportional to 765.99, 1,149.18 and 279.45 is: 419.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.99 : 1,149.18 = 279.45 : x
  2. Step 2: Convert to fraction form
    765.99/1,149.18 = 279.45/x
  3. Step 3: Cross multiply
    765.99x = 1,149.18 × 279.45
  4. Step 4: Simplify right side
    765.99x = 321,138.35
  5. Step 5: Solve for x
    x = 321,138.35/765.99
  6. Step 6: Final answer
    x = 419.25

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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.