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Finding the Fourth Proportional to 3,178.73, 4,768.61 and 987.96

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Solution

The fourth proportional to 3,178.73, 4,768.61 and 987.96 is: 1,482.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.73 : 4,768.61 = 987.96 : x
  2. Step 2: Convert to fraction form
    3,178.73/4,768.61 = 987.96/x
  3. Step 3: Cross multiply
    3,178.73x = 4,768.61 × 987.96
  4. Step 4: Simplify right side
    3,178.73x = 4,711,208.88
  5. Step 5: Solve for x
    x = 4,711,208.88/3,178.73
  6. Step 6: Final answer
    x = 1,482.11

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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.