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Finding the Fourth Proportional to 289.34, 434.01 and 72.92

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Solution

The fourth proportional to 289.34, 434.01 and 72.92 is: 109.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.34 : 434.01 = 72.92 : x
  2. Step 2: Convert to fraction form
    289.34/434.01 = 72.92/x
  3. Step 3: Cross multiply
    289.34x = 434.01 × 72.92
  4. Step 4: Simplify right side
    289.34x = 31,646.72
  5. Step 5: Solve for x
    x = 31,646.72/289.34
  6. Step 6: Final answer
    x = 109.38

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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.