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Finding the Fourth Proportional to 916.98, 1,375.68 and 300.72

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Solution

The fourth proportional to 916.98, 1,375.68 and 300.72 is: 451.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.98 : 1,375.68 = 300.72 : x
  2. Step 2: Convert to fraction form
    916.98/1,375.68 = 300.72/x
  3. Step 3: Cross multiply
    916.98x = 1,375.68 × 300.72
  4. Step 4: Simplify right side
    916.98x = 413,694.49
  5. Step 5: Solve for x
    x = 413,694.49/916.98
  6. Step 6: Final answer
    x = 451.15

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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.