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Finding the Fourth Proportional to 394.84, 592.20 and 138.32

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Solution

The fourth proportional to 394.84, 592.20 and 138.32 is: 207.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.84 : 592.20 = 138.32 : x
  2. Step 2: Convert to fraction form
    394.84/592.20 = 138.32/x
  3. Step 3: Cross multiply
    394.84x = 592.20 × 138.32
  4. Step 4: Simplify right side
    394.84x = 81,913.10
  5. Step 5: Solve for x
    x = 81,913.10/394.84
  6. Step 6: Final answer
    x = 207.46

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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.