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Finding the Fourth Proportional to 378.17, 522.02 and 285.18

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Solution

The fourth proportional to 378.17, 522.02 and 285.18 is: 393.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.17 : 522.02 = 285.18 : x
  2. Step 2: Convert to fraction form
    378.17/522.02 = 285.18/x
  3. Step 3: Cross multiply
    378.17x = 522.02 × 285.18
  4. Step 4: Simplify right side
    378.17x = 148,870.20
  5. Step 5: Solve for x
    x = 148,870.20/378.17
  6. Step 6: Final answer
    x = 393.66

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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.