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Finding the Fourth Proportional to 926.88, 1,278.02 and 861.27

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Solution

The fourth proportional to 926.88, 1,278.02 and 861.27 is: 1,187.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.88 : 1,278.02 = 861.27 : x
  2. Step 2: Convert to fraction form
    926.88/1,278.02 = 861.27/x
  3. Step 3: Cross multiply
    926.88x = 1,278.02 × 861.27
  4. Step 4: Simplify right side
    926.88x = 1,100,715.98
  5. Step 5: Solve for x
    x = 1,100,715.98/926.88
  6. Step 6: Final answer
    x = 1,187.55

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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.