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Finding the Fourth Proportional to 2,664.16, 3,996.86 and 815.55

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Solution

The fourth proportional to 2,664.16, 3,996.86 and 815.55 is: 1,223.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,664.16 : 3,996.86 = 815.55 : x
  2. Step 2: Convert to fraction form
    2,664.16/3,996.86 = 815.55/x
  3. Step 3: Cross multiply
    2,664.16x = 3,996.86 × 815.55
  4. Step 4: Simplify right side
    2,664.16x = 3,259,639.17
  5. Step 5: Solve for x
    x = 3,259,639.17/2,664.16
  6. Step 6: Final answer
    x = 1,223.51

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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.