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Finding the Fourth Proportional to 711.87, 1,068.13 and 321.97

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Solution

The fourth proportional to 711.87, 1,068.13 and 321.97 is: 483.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.87 : 1,068.13 = 321.97 : x
  2. Step 2: Convert to fraction form
    711.87/1,068.13 = 321.97/x
  3. Step 3: Cross multiply
    711.87x = 1,068.13 × 321.97
  4. Step 4: Simplify right side
    711.87x = 343,905.82
  5. Step 5: Solve for x
    x = 343,905.82/711.87
  6. Step 6: Final answer
    x = 483.10

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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.