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Finding the Fourth Proportional to 3,187.68, 4,781.52 and 879.12

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Solution

The fourth proportional to 3,187.68, 4,781.52 and 879.12 is: 1,318.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,187.68 : 4,781.52 = 879.12 : x
  2. Step 2: Convert to fraction form
    3,187.68/4,781.52 = 879.12/x
  3. Step 3: Cross multiply
    3,187.68x = 4,781.52 × 879.12
  4. Step 4: Simplify right side
    3,187.68x = 4,203,529.86
  5. Step 5: Solve for x
    x = 4,203,529.86/3,187.68
  6. Step 6: Final answer
    x = 1,318.68

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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.