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Finding the Fourth Proportional to 916.61, 1,375.20 and 300.32

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Solution

The fourth proportional to 916.61, 1,375.20 and 300.32 is: 450.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.61 : 1,375.20 = 300.32 : x
  2. Step 2: Convert to fraction form
    916.61/1,375.20 = 300.32/x
  3. Step 3: Cross multiply
    916.61x = 1,375.20 × 300.32
  4. Step 4: Simplify right side
    916.61x = 412,991.69
  5. Step 5: Solve for x
    x = 412,991.69/916.61
  6. Step 6: Final answer
    x = 450.57

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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.