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Finding the Fourth Proportional to 289.47, 434.28 and 133.22

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Solution

The fourth proportional to 289.47, 434.28 and 133.22 is: 199.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.47 : 434.28 = 133.22 : x
  2. Step 2: Convert to fraction form
    289.47/434.28 = 133.22/x
  3. Step 3: Cross multiply
    289.47x = 434.28 × 133.22
  4. Step 4: Simplify right side
    289.47x = 57,854.78
  5. Step 5: Solve for x
    x = 57,854.78/289.47
  6. Step 6: Final answer
    x = 199.86

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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.