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Finding the Fourth Proportional to 711.70, 1,066.65 and 321.28

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Solution

The fourth proportional to 711.70, 1,066.65 and 321.28 is: 481.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.70 : 1,066.65 = 321.28 : x
  2. Step 2: Convert to fraction form
    711.70/1,066.65 = 321.28/x
  3. Step 3: Cross multiply
    711.70x = 1,066.65 × 321.28
  4. Step 4: Simplify right side
    711.70x = 342,693.31
  5. Step 5: Solve for x
    x = 342,693.31/711.70
  6. Step 6: Final answer
    x = 481.51

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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.