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Finding the Fourth Proportional to 711.02, 1,066.53 and 217.43

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Solution

The fourth proportional to 711.02, 1,066.53 and 217.43 is: 326.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.02 : 1,066.53 = 217.43 : x
  2. Step 2: Convert to fraction form
    711.02/1,066.53 = 217.43/x
  3. Step 3: Cross multiply
    711.02x = 1,066.53 × 217.43
  4. Step 4: Simplify right side
    711.02x = 231,894.53
  5. Step 5: Solve for x
    x = 231,894.53/711.02
  6. Step 6: Final answer
    x = 326.14

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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.