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Finding the Fourth Proportional to 2,612.40, 3,918.85 and 763.47

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Solution

The fourth proportional to 2,612.40, 3,918.85 and 763.47 is: 1,145.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.40 : 3,918.85 = 763.47 : x
  2. Step 2: Convert to fraction form
    2,612.40/3,918.85 = 763.47/x
  3. Step 3: Cross multiply
    2,612.40x = 3,918.85 × 763.47
  4. Step 4: Simplify right side
    2,612.40x = 2,991,910.80
  5. Step 5: Solve for x
    x = 2,991,910.80/2,612.40
  6. Step 6: Final answer
    x = 1,145.28

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1.5x scale

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.