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Finding the Fourth Proportional to 393.11, 589.36 and 312.31

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Solution

The fourth proportional to 393.11, 589.36 and 312.31 is: 468.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.11 : 589.36 = 312.31 : x
  2. Step 2: Convert to fraction form
    393.11/589.36 = 312.31/x
  3. Step 3: Cross multiply
    393.11x = 589.36 × 312.31
  4. Step 4: Simplify right side
    393.11x = 184,063.02
  5. Step 5: Solve for x
    x = 184,063.02/393.11
  6. Step 6: Final answer
    x = 468.22

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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.