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Finding the Fourth Proportional to 908.04, 1,362.12 and 421.02

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Solution

The fourth proportional to 908.04, 1,362.12 and 421.02 is: 631.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.04 : 1,362.12 = 421.02 : x
  2. Step 2: Convert to fraction form
    908.04/1,362.12 = 421.02/x
  3. Step 3: Cross multiply
    908.04x = 1,362.12 × 421.02
  4. Step 4: Simplify right side
    908.04x = 573,479.76
  5. Step 5: Solve for x
    x = 573,479.76/908.04
  6. Step 6: Final answer
    x = 631.56

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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.