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Finding the Fourth Proportional to 1,178.11, 1,625.72 and 680.90

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Solution

The fourth proportional to 1,178.11, 1,625.72 and 680.90 is: 939.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.11 : 1,625.72 = 680.90 : x
  2. Step 2: Convert to fraction form
    1,178.11/1,625.72 = 680.90/x
  3. Step 3: Cross multiply
    1,178.11x = 1,625.72 × 680.90
  4. Step 4: Simplify right side
    1,178.11x = 1,106,952.75
  5. Step 5: Solve for x
    x = 1,106,952.75/1,178.11
  6. Step 6: Final answer
    x = 939.60

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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.