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Finding the Fourth Proportional to 915.35, 1,372.85 and 299.51

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Solution

The fourth proportional to 915.35, 1,372.85 and 299.51 is: 449.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.35 : 1,372.85 = 299.51 : x
  2. Step 2: Convert to fraction form
    915.35/1,372.85 = 299.51/x
  3. Step 3: Cross multiply
    915.35x = 1,372.85 × 299.51
  4. Step 4: Simplify right side
    915.35x = 411,180.21
  5. Step 5: Solve for x
    x = 411,180.21/915.35
  6. Step 6: Final answer
    x = 449.21

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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.