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Finding the Fourth Proportional to 1,178.45, 1,767.65 and 398.43

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Solution

The fourth proportional to 1,178.45, 1,767.65 and 398.43 is: 597.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.45 : 1,767.65 = 398.43 : x
  2. Step 2: Convert to fraction form
    1,178.45/1,767.65 = 398.43/x
  3. Step 3: Cross multiply
    1,178.45x = 1,767.65 × 398.43
  4. Step 4: Simplify right side
    1,178.45x = 704,282.80
  5. Step 5: Solve for x
    x = 704,282.80/1,178.45
  6. Step 6: Final answer
    x = 597.64

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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.