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Finding the Fourth Proportional to 2,612.28, 3,918.78 and 763.16

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Solution

The fourth proportional to 2,612.28, 3,918.78 and 763.16 is: 1,144.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.28 : 3,918.78 = 763.16 : x
  2. Step 2: Convert to fraction form
    2,612.28/3,918.78 = 763.16/x
  3. Step 3: Cross multiply
    2,612.28x = 3,918.78 × 763.16
  4. Step 4: Simplify right side
    2,612.28x = 2,990,636.55
  5. Step 5: Solve for x
    x = 2,990,636.55/2,612.28
  6. Step 6: Final answer
    x = 1,144.84

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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.