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Finding the Fourth Proportional to 1,178.68, 1,767.32 and 447.78

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Solution

The fourth proportional to 1,178.68, 1,767.32 and 447.78 is: 671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.68 : 1,767.32 = 447.78 : x
  2. Step 2: Convert to fraction form
    1,178.68/1,767.32 = 447.78/x
  3. Step 3: Cross multiply
    1,178.68x = 1,767.32 × 447.78
  4. Step 4: Simplify right side
    1,178.68x = 791,370.55
  5. Step 5: Solve for x
    x = 791,370.55/1,178.68
  6. Step 6: Final answer
    x = 671.40

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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.