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Finding the Fourth Proportional to 289.32, 433.96 and 91.66

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Solution

The fourth proportional to 289.32, 433.96 and 91.66 is: 137.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.32 : 433.96 = 91.66 : x
  2. Step 2: Convert to fraction form
    289.32/433.96 = 91.66/x
  3. Step 3: Cross multiply
    289.32x = 433.96 × 91.66
  4. Step 4: Simplify right side
    289.32x = 39,776.77
  5. Step 5: Solve for x
    x = 39,776.77/289.32
  6. Step 6: Final answer
    x = 137.48

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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.