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Finding the Fourth Proportional to 1,178.80, 1,766.40 and 995.20

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Solution

The fourth proportional to 1,178.80, 1,766.40 and 995.20 is: 1,491.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.80 : 1,766.40 = 995.20 : x
  2. Step 2: Convert to fraction form
    1,178.80/1,766.40 = 995.20/x
  3. Step 3: Cross multiply
    1,178.80x = 1,766.40 × 995.20
  4. Step 4: Simplify right side
    1,178.80x = 1,757,921.28
  5. Step 5: Solve for x
    x = 1,757,921.28/1,178.80
  6. Step 6: Final answer
    x = 1,491.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.