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Finding the Fourth Proportional to 392.45, 542.34 and 322.40

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Solution

The fourth proportional to 392.45, 542.34 and 322.40 is: 445.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.45 : 542.34 = 322.40 : x
  2. Step 2: Convert to fraction form
    392.45/542.34 = 322.40/x
  3. Step 3: Cross multiply
    392.45x = 542.34 × 322.40
  4. Step 4: Simplify right side
    392.45x = 174,847.70
  5. Step 5: Solve for x
    x = 174,847.70/392.45
  6. Step 6: Final answer
    x = 445.53

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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.