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Finding the Fourth Proportional to 908.36, 1,361.58 and 421

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Solution

The fourth proportional to 908.36, 1,361.58 and 421 is: 631.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.36 : 1,361.58 = 421 : x
  2. Step 2: Convert to fraction form
    908.36/1,361.58 = 421/x
  3. Step 3: Cross multiply
    908.36x = 1,361.58 × 421
  4. Step 4: Simplify right side
    908.36x = 573,225.18
  5. Step 5: Solve for x
    x = 573,225.18/908.36
  6. Step 6: Final answer
    x = 631.06

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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.