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Finding the Fourth Proportional to 3,178.40, 4,767.60 and 987.80

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Solution

The fourth proportional to 3,178.40, 4,767.60 and 987.80 is: 1,481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.40 : 4,767.60 = 987.80 : x
  2. Step 2: Convert to fraction form
    3,178.40/4,767.60 = 987.80/x
  3. Step 3: Cross multiply
    3,178.40x = 4,767.60 × 987.80
  4. Step 4: Simplify right side
    3,178.40x = 4,709,435.28
  5. Step 5: Solve for x
    x = 4,709,435.28/3,178.40
  6. Step 6: Final answer
    x = 1,481.70

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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.