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Finding the Fourth Proportional to 916.05, 1,374.29 and 299.75

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Solution

The fourth proportional to 916.05, 1,374.29 and 299.75 is: 449.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.05 : 1,374.29 = 299.75 : x
  2. Step 2: Convert to fraction form
    916.05/1,374.29 = 299.75/x
  3. Step 3: Cross multiply
    916.05x = 1,374.29 × 299.75
  4. Step 4: Simplify right side
    916.05x = 411,943.43
  5. Step 5: Solve for x
    x = 411,943.43/916.05
  6. Step 6: Final answer
    x = 449.70

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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.