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Finding the Fourth Proportional to 711.21, 1,066.81 and 217.62

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Solution

The fourth proportional to 711.21, 1,066.81 and 217.62 is: 326.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.21 : 1,066.81 = 217.62 : x
  2. Step 2: Convert to fraction form
    711.21/1,066.81 = 217.62/x
  3. Step 3: Cross multiply
    711.21x = 1,066.81 × 217.62
  4. Step 4: Simplify right side
    711.21x = 232,159.19
  5. Step 5: Solve for x
    x = 232,159.19/711.21
  6. Step 6: Final answer
    x = 326.43

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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.