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Finding the Fourth Proportional to 915.05, 1,372.58 and 221.71

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Solution

The fourth proportional to 915.05, 1,372.58 and 221.71 is: 332.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.05 : 1,372.58 = 221.71 : x
  2. Step 2: Convert to fraction form
    915.05/1,372.58 = 221.71/x
  3. Step 3: Cross multiply
    915.05x = 1,372.58 × 221.71
  4. Step 4: Simplify right side
    915.05x = 304,320.94
  5. Step 5: Solve for x
    x = 304,320.94/915.05
  6. Step 6: Final answer
    x = 332.57

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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.