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Finding the Fourth Proportional to 3,178.65, 4,768.70 and 987.60

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Solution

The fourth proportional to 3,178.65, 4,768.70 and 987.60 is: 1,481.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.65 : 4,768.70 = 987.60 : x
  2. Step 2: Convert to fraction form
    3,178.65/4,768.70 = 987.60/x
  3. Step 3: Cross multiply
    3,178.65x = 4,768.70 × 987.60
  4. Step 4: Simplify right side
    3,178.65x = 4,709,568.12
  5. Step 5: Solve for x
    x = 4,709,568.12/3,178.65
  6. Step 6: Final answer
    x = 1,481.63

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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.