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Finding the Fourth Proportional to 1,815.13, 2,722.69 and 660.88

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Solution

The fourth proportional to 1,815.13, 2,722.69 and 660.88 is: 991.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.13 : 2,722.69 = 660.88 : x
  2. Step 2: Convert to fraction form
    1,815.13/2,722.69 = 660.88/x
  3. Step 3: Cross multiply
    1,815.13x = 2,722.69 × 660.88
  4. Step 4: Simplify right side
    1,815.13x = 1,799,368.06
  5. Step 5: Solve for x
    x = 1,799,368.06/1,815.13
  6. Step 6: Final answer
    x = 991.32

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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.