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Finding the Fourth Proportional to 1,776.78, 2,452.01 and 990.90

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Solution

The fourth proportional to 1,776.78, 2,452.01 and 990.90 is: 1,367.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.78 : 2,452.01 = 990.90 : x
  2. Step 2: Convert to fraction form
    1,776.78/2,452.01 = 990.90/x
  3. Step 3: Cross multiply
    1,776.78x = 2,452.01 × 990.90
  4. Step 4: Simplify right side
    1,776.78x = 2,429,691.75
  5. Step 5: Solve for x
    x = 2,429,691.75/1,776.78
  6. Step 6: Final answer
    x = 1,367.47

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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.