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Finding the Fourth Proportional to 767.10, 1,149.62 and 279.69

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Solution

The fourth proportional to 767.10, 1,149.62 and 279.69 is: 419.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.10 : 1,149.62 = 279.69 : x
  2. Step 2: Convert to fraction form
    767.10/1,149.62 = 279.69/x
  3. Step 3: Cross multiply
    767.10x = 1,149.62 × 279.69
  4. Step 4: Simplify right side
    767.10x = 321,537.22
  5. Step 5: Solve for x
    x = 321,537.22/767.10
  6. Step 6: Final answer
    x = 419.16

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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.