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Finding the Fourth Proportional to 1,651.12, 2,278.57 and 988

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Solution

The fourth proportional to 1,651.12, 2,278.57 and 988 is: 1,363.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,651.12 : 2,278.57 = 988 : x
  2. Step 2: Convert to fraction form
    1,651.12/2,278.57 = 988/x
  3. Step 3: Cross multiply
    1,651.12x = 2,278.57 × 988
  4. Step 4: Simplify right side
    1,651.12x = 2,251,229.63
  5. Step 5: Solve for x
    x = 2,251,229.63/1,651.12
  6. Step 6: Final answer
    x = 1,363.46

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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.