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Finding the Fourth Proportional to 289.29, 398.81 and 178.70

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Solution

The fourth proportional to 289.29, 398.81 and 178.70 is: 246.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.29 : 398.81 = 178.70 : x
  2. Step 2: Convert to fraction form
    289.29/398.81 = 178.70/x
  3. Step 3: Cross multiply
    289.29x = 398.81 × 178.70
  4. Step 4: Simplify right side
    289.29x = 71,266.45
  5. Step 5: Solve for x
    x = 71,266.45/289.29
  6. Step 6: Final answer
    x = 246.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.