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Finding the Fourth Proportional to 392.20, 542 and 322.14

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Solution

The fourth proportional to 392.20, 542 and 322.14 is: 445.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.20 : 542 = 322.14 : x
  2. Step 2: Convert to fraction form
    392.20/542 = 322.14/x
  3. Step 3: Cross multiply
    392.20x = 542 × 322.14
  4. Step 4: Simplify right side
    392.20x = 174,599.88
  5. Step 5: Solve for x
    x = 174,599.88/392.20
  6. Step 6: Final answer
    x = 445.18

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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.