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Finding the Fourth Proportional to 908.51, 1,362.29 and 421.13

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Solution

The fourth proportional to 908.51, 1,362.29 and 421.13 is: 631.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.51 : 1,362.29 = 421.13 : x
  2. Step 2: Convert to fraction form
    908.51/1,362.29 = 421.13/x
  3. Step 3: Cross multiply
    908.51x = 1,362.29 × 421.13
  4. Step 4: Simplify right side
    908.51x = 573,692.27
  5. Step 5: Solve for x
    x = 573,692.27/908.51
  6. Step 6: Final answer
    x = 631.47

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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.