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Finding the Fourth Proportional to 908.39, 1,363.11 and 421.42

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Solution

The fourth proportional to 908.39, 1,363.11 and 421.42 is: 632.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.39 : 1,363.11 = 421.42 : x
  2. Step 2: Convert to fraction form
    908.39/1,363.11 = 421.42/x
  3. Step 3: Cross multiply
    908.39x = 1,363.11 × 421.42
  4. Step 4: Simplify right side
    908.39x = 574,435.00
  5. Step 5: Solve for x
    x = 574,435.00/908.39
  6. Step 6: Final answer
    x = 632.37

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1.5x scale

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.