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Finding the Fourth Proportional to 393.90, 589.59 and 285.18

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Solution

The fourth proportional to 393.90, 589.59 and 285.18 is: 426.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.90 : 589.59 = 285.18 : x
  2. Step 2: Convert to fraction form
    393.90/589.59 = 285.18/x
  3. Step 3: Cross multiply
    393.90x = 589.59 × 285.18
  4. Step 4: Simplify right side
    393.90x = 168,139.28
  5. Step 5: Solve for x
    x = 168,139.28/393.90
  6. Step 6: Final answer
    x = 426.86

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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.