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Finding the Fourth Proportional to 393.87, 589.87 and 312.76

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Solution

The fourth proportional to 393.87, 589.87 and 312.76 is: 468.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.87 : 589.87 = 312.76 : x
  2. Step 2: Convert to fraction form
    393.87/589.87 = 312.76/x
  3. Step 3: Cross multiply
    393.87x = 589.87 × 312.76
  4. Step 4: Simplify right side
    393.87x = 184,487.74
  5. Step 5: Solve for x
    x = 184,487.74/393.87
  6. Step 6: Final answer
    x = 468.40

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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.