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Finding the Fourth Proportional to 1,081.60, 1,612.10 and 1,020.08

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Solution

The fourth proportional to 1,081.60, 1,612.10 and 1,020.08 is: 1,520.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.60 : 1,612.10 = 1,020.08 : x
  2. Step 2: Convert to fraction form
    1,081.60/1,612.10 = 1,020.08/x
  3. Step 3: Cross multiply
    1,081.60x = 1,612.10 × 1,020.08
  4. Step 4: Simplify right side
    1,081.60x = 1,644,470.97
  5. Step 5: Solve for x
    x = 1,644,470.97/1,081.60
  6. Step 6: Final answer
    x = 1,520.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.