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Finding the Fourth Proportional to 1,651.13, 2,278.55 and 988.07

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Solution

The fourth proportional to 1,651.13, 2,278.55 and 988.07 is: 1,363.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,651.13 : 2,278.55 = 988.07 : x
  2. Step 2: Convert to fraction form
    1,651.13/2,278.55 = 988.07/x
  3. Step 3: Cross multiply
    1,651.13x = 2,278.55 × 988.07
  4. Step 4: Simplify right side
    1,651.13x = 2,251,375.07
  5. Step 5: Solve for x
    x = 2,251,375.07/1,651.13
  6. Step 6: Final answer
    x = 1,363.54

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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.