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Finding the Fourth Proportional to 289.49, 434.21 and 97.11

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Solution

The fourth proportional to 289.49, 434.21 and 97.11 is: 145.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.49 : 434.21 = 97.11 : x
  2. Step 2: Convert to fraction form
    289.49/434.21 = 97.11/x
  3. Step 3: Cross multiply
    289.49x = 434.21 × 97.11
  4. Step 4: Simplify right side
    289.49x = 42,165.65
  5. Step 5: Solve for x
    x = 42,165.65/289.49
  6. Step 6: Final answer
    x = 145.66

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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.