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Finding the Fourth Proportional to 908.91, 1,363.54 and 388.91

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Solution

The fourth proportional to 908.91, 1,363.54 and 388.91 is: 583.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.91 : 1,363.54 = 388.91 : x
  2. Step 2: Convert to fraction form
    908.91/1,363.54 = 388.91/x
  3. Step 3: Cross multiply
    908.91x = 1,363.54 × 388.91
  4. Step 4: Simplify right side
    908.91x = 530,292.40
  5. Step 5: Solve for x
    x = 530,292.40/908.91
  6. Step 6: Final answer
    x = 583.44

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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.