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Finding the Fourth Proportional to 915.99, 1,374.12 and 299.72

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Solution

The fourth proportional to 915.99, 1,374.12 and 299.72 is: 449.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.99 : 1,374.12 = 299.72 : x
  2. Step 2: Convert to fraction form
    915.99/1,374.12 = 299.72/x
  3. Step 3: Cross multiply
    915.99x = 1,374.12 × 299.72
  4. Step 4: Simplify right side
    915.99x = 411,844.38
  5. Step 5: Solve for x
    x = 411,844.38/915.99
  6. Step 6: Final answer
    x = 449.62

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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.