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Finding the Fourth Proportional to 289.12, 399.10 and 178.70

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Solution

The fourth proportional to 289.12, 399.10 and 178.70 is: 246.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.12 : 399.10 = 178.70 : x
  2. Step 2: Convert to fraction form
    289.12/399.10 = 178.70/x
  3. Step 3: Cross multiply
    289.12x = 399.10 × 178.70
  4. Step 4: Simplify right side
    289.12x = 71,319.17
  5. Step 5: Solve for x
    x = 71,319.17/289.12
  6. Step 6: Final answer
    x = 246.68

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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.