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Finding the Fourth Proportional to 289.66, 434.78 and 181.72

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Solution

The fourth proportional to 289.66, 434.78 and 181.72 is: 272.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.66 : 434.78 = 181.72 : x
  2. Step 2: Convert to fraction form
    289.66/434.78 = 181.72/x
  3. Step 3: Cross multiply
    289.66x = 434.78 × 181.72
  4. Step 4: Simplify right side
    289.66x = 79,008.22
  5. Step 5: Solve for x
    x = 79,008.22/289.66
  6. Step 6: Final answer
    x = 272.76

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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.