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Finding the Fourth Proportional to 1,290.56, 1,781.78 and 849.20

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Solution

The fourth proportional to 1,290.56, 1,781.78 and 849.20 is: 1,172.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.56 : 1,781.78 = 849.20 : x
  2. Step 2: Convert to fraction form
    1,290.56/1,781.78 = 849.20/x
  3. Step 3: Cross multiply
    1,290.56x = 1,781.78 × 849.20
  4. Step 4: Simplify right side
    1,290.56x = 1,513,074.42
  5. Step 5: Solve for x
    x = 1,513,074.42/1,290.56
  6. Step 6: Final answer
    x = 1,172.42

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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.