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Finding the Fourth Proportional to 390.84, 588.58 and 283.38

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Solution

The fourth proportional to 390.84, 588.58 and 283.38 is: 426.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.84 : 588.58 = 283.38 : x
  2. Step 2: Convert to fraction form
    390.84/588.58 = 283.38/x
  3. Step 3: Cross multiply
    390.84x = 588.58 × 283.38
  4. Step 4: Simplify right side
    390.84x = 166,791.80
  5. Step 5: Solve for x
    x = 166,791.80/390.84
  6. Step 6: Final answer
    x = 426.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.