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Finding the Fourth Proportional to 915.29, 1,372.67 and 299.05

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Solution

The fourth proportional to 915.29, 1,372.67 and 299.05 is: 448.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.29 : 1,372.67 = 299.05 : x
  2. Step 2: Convert to fraction form
    915.29/1,372.67 = 299.05/x
  3. Step 3: Cross multiply
    915.29x = 1,372.67 × 299.05
  4. Step 4: Simplify right side
    915.29x = 410,496.96
  5. Step 5: Solve for x
    x = 410,496.96/915.29
  6. Step 6: Final answer
    x = 448.49

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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.