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Finding the Fourth Proportional to 908.43, 1,362.18 and 421.82

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Solution

The fourth proportional to 908.43, 1,362.18 and 421.82 is: 632.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.43 : 1,362.18 = 421.82 : x
  2. Step 2: Convert to fraction form
    908.43/1,362.18 = 421.82/x
  3. Step 3: Cross multiply
    908.43x = 1,362.18 × 421.82
  4. Step 4: Simplify right side
    908.43x = 574,594.77
  5. Step 5: Solve for x
    x = 574,594.77/908.43
  6. Step 6: Final answer
    x = 632.52

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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.