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Finding the Fourth Proportional to 289.96, 434.80 and 143.72

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Solution

The fourth proportional to 289.96, 434.80 and 143.72 is: 215.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.96 : 434.80 = 143.72 : x
  2. Step 2: Convert to fraction form
    289.96/434.80 = 143.72/x
  3. Step 3: Cross multiply
    289.96x = 434.80 × 143.72
  4. Step 4: Simplify right side
    289.96x = 62,489.46
  5. Step 5: Solve for x
    x = 62,489.46/289.96
  6. Step 6: Final answer
    x = 215.51

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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.