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Finding the Fourth Proportional to 908.86, 1,362.48 and 421.52

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Solution

The fourth proportional to 908.86, 1,362.48 and 421.52 is: 631.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.86 : 1,362.48 = 421.52 : x
  2. Step 2: Convert to fraction form
    908.86/1,362.48 = 421.52/x
  3. Step 3: Cross multiply
    908.86x = 1,362.48 × 421.52
  4. Step 4: Simplify right side
    908.86x = 574,312.57
  5. Step 5: Solve for x
    x = 574,312.57/908.86
  6. Step 6: Final answer
    x = 631.90

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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.