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Finding the Fourth Proportional to 908.72, 1,363.82 and 421.84

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Solution

The fourth proportional to 908.72, 1,363.82 and 421.84 is: 633.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.72 : 1,363.82 = 421.84 : x
  2. Step 2: Convert to fraction form
    908.72/1,363.82 = 421.84/x
  3. Step 3: Cross multiply
    908.72x = 1,363.82 × 421.84
  4. Step 4: Simplify right side
    908.72x = 575,313.83
  5. Step 5: Solve for x
    x = 575,313.83/908.72
  6. Step 6: Final answer
    x = 633.10

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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.