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Finding the Fourth Proportional to 917.17, 1,375.91 and 300.71

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Solution

The fourth proportional to 917.17, 1,375.91 and 300.71 is: 451.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.17 : 1,375.91 = 300.71 : x
  2. Step 2: Convert to fraction form
    917.17/1,375.91 = 300.71/x
  3. Step 3: Cross multiply
    917.17x = 1,375.91 × 300.71
  4. Step 4: Simplify right side
    917.17x = 413,753.81
  5. Step 5: Solve for x
    x = 413,753.81/917.17
  6. Step 6: Final answer
    x = 451.12

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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.