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Finding the Fourth Proportional to 3,451.95, 5,178.11 and 987.13

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Solution

The fourth proportional to 3,451.95, 5,178.11 and 987.13 is: 1,480.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,451.95 : 5,178.11 = 987.13 : x
  2. Step 2: Convert to fraction form
    3,451.95/5,178.11 = 987.13/x
  3. Step 3: Cross multiply
    3,451.95x = 5,178.11 × 987.13
  4. Step 4: Simplify right side
    3,451.95x = 5,111,469.26
  5. Step 5: Solve for x
    x = 5,111,469.26/3,451.95
  6. Step 6: Final answer
    x = 1,480.75

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Double scale
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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.