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Finding the Fourth Proportional to 908.17, 1,362.27 and 387.91

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Solution

The fourth proportional to 908.17, 1,362.27 and 387.91 is: 581.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.17 : 1,362.27 = 387.91 : x
  2. Step 2: Convert to fraction form
    908.17/1,362.27 = 387.91/x
  3. Step 3: Cross multiply
    908.17x = 1,362.27 × 387.91
  4. Step 4: Simplify right side
    908.17x = 528,435.85
  5. Step 5: Solve for x
    x = 528,435.85/908.17
  6. Step 6: Final answer
    x = 581.87

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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.