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Finding the Fourth Proportional to 378.84, 522.18 and 291.54

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Solution

The fourth proportional to 378.84, 522.18 and 291.54 is: 401.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.84 : 522.18 = 291.54 : x
  2. Step 2: Convert to fraction form
    378.84/522.18 = 291.54/x
  3. Step 3: Cross multiply
    378.84x = 522.18 × 291.54
  4. Step 4: Simplify right side
    378.84x = 152,236.36
  5. Step 5: Solve for x
    x = 152,236.36/378.84
  6. Step 6: Final answer
    x = 401.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.