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Finding the Fourth Proportional to 1,617.20, 2,231.46 and 908.86

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Solution

The fourth proportional to 1,617.20, 2,231.46 and 908.86 is: 1,254.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.20 : 2,231.46 = 908.86 : x
  2. Step 2: Convert to fraction form
    1,617.20/2,231.46 = 908.86/x
  3. Step 3: Cross multiply
    1,617.20x = 2,231.46 × 908.86
  4. Step 4: Simplify right side
    1,617.20x = 2,028,084.74
  5. Step 5: Solve for x
    x = 2,028,084.74/1,617.20
  6. Step 6: Final answer
    x = 1,254.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.