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Finding the Fourth Proportional to 1,178.15, 1,767.28 and 447.78

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Solution

The fourth proportional to 1,178.15, 1,767.28 and 447.78 is: 671.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.15 : 1,767.28 = 447.78 : x
  2. Step 2: Convert to fraction form
    1,178.15/1,767.28 = 447.78/x
  3. Step 3: Cross multiply
    1,178.15x = 1,767.28 × 447.78
  4. Step 4: Simplify right side
    1,178.15x = 791,352.64
  5. Step 5: Solve for x
    x = 791,352.64/1,178.15
  6. Step 6: Final answer
    x = 671.69

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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.