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Finding the Fourth Proportional to 908.30, 1,361.83 and 421.08

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Solution

The fourth proportional to 908.30, 1,361.83 and 421.08 is: 631.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.30 : 1,361.83 = 421.08 : x
  2. Step 2: Convert to fraction form
    908.30/1,361.83 = 421.08/x
  3. Step 3: Cross multiply
    908.30x = 1,361.83 × 421.08
  4. Step 4: Simplify right side
    908.30x = 573,439.38
  5. Step 5: Solve for x
    x = 573,439.38/908.30
  6. Step 6: Final answer
    x = 631.33

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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.