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Finding the Fourth Proportional to 1,178.90, 1,767.10 and 398.19

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Solution

The fourth proportional to 1,178.90, 1,767.10 and 398.19 is: 596.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.90 : 1,767.10 = 398.19 : x
  2. Step 2: Convert to fraction form
    1,178.90/1,767.10 = 398.19/x
  3. Step 3: Cross multiply
    1,178.90x = 1,767.10 × 398.19
  4. Step 4: Simplify right side
    1,178.90x = 703,641.55
  5. Step 5: Solve for x
    x = 703,641.55/1,178.90
  6. Step 6: Final answer
    x = 596.86

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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.