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Finding the Fourth Proportional to 421.39, 631.17 and 266.93

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Solution

The fourth proportional to 421.39, 631.17 and 266.93 is: 399.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.39 : 631.17 = 266.93 : x
  2. Step 2: Convert to fraction form
    421.39/631.17 = 266.93/x
  3. Step 3: Cross multiply
    421.39x = 631.17 × 266.93
  4. Step 4: Simplify right side
    421.39x = 168,476.67
  5. Step 5: Solve for x
    x = 168,476.67/421.39
  6. Step 6: Final answer
    x = 399.82

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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.