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Finding the Fourth Proportional to 3,179.54, 4,769.62 and 987.68

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Solution

The fourth proportional to 3,179.54, 4,769.62 and 987.68 is: 1,481.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.54 : 4,769.62 = 987.68 : x
  2. Step 2: Convert to fraction form
    3,179.54/4,769.62 = 987.68/x
  3. Step 3: Cross multiply
    3,179.54x = 4,769.62 × 987.68
  4. Step 4: Simplify right side
    3,179.54x = 4,710,867.74
  5. Step 5: Solve for x
    x = 4,710,867.74/3,179.54
  6. Step 6: Final answer
    x = 1,481.62

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1.5x scale

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.