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Finding the Fourth Proportional to 908.43, 1,362.93 and 421.20

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Solution

The fourth proportional to 908.43, 1,362.93 and 421.20 is: 631.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.43 : 1,362.93 = 421.20 : x
  2. Step 2: Convert to fraction form
    908.43/1,362.93 = 421.20/x
  3. Step 3: Cross multiply
    908.43x = 1,362.93 × 421.20
  4. Step 4: Simplify right side
    908.43x = 574,066.12
  5. Step 5: Solve for x
    x = 574,066.12/908.43
  6. Step 6: Final answer
    x = 631.93

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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.