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Finding the Fourth Proportional to 393.68, 589.20 and 312.68

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Solution

The fourth proportional to 393.68, 589.20 and 312.68 is: 467.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.68 : 589.20 = 312.68 : x
  2. Step 2: Convert to fraction form
    393.68/589.20 = 312.68/x
  3. Step 3: Cross multiply
    393.68x = 589.20 × 312.68
  4. Step 4: Simplify right side
    393.68x = 184,231.06
  5. Step 5: Solve for x
    x = 184,231.06/393.68
  6. Step 6: Final answer
    x = 467.97

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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.