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Finding the Fourth Proportional to 908.81, 1,363.26 and 388.88

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Solution

The fourth proportional to 908.81, 1,363.26 and 388.88 is: 583.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.81 : 1,363.26 = 388.88 : x
  2. Step 2: Convert to fraction form
    908.81/1,363.26 = 388.88/x
  3. Step 3: Cross multiply
    908.81x = 1,363.26 × 388.88
  4. Step 4: Simplify right side
    908.81x = 530,144.55
  5. Step 5: Solve for x
    x = 530,144.55/908.81
  6. Step 6: Final answer
    x = 583.34

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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.