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Finding the Fourth Proportional to 392.16, 540.96 and 304.80

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Solution

The fourth proportional to 392.16, 540.96 and 304.80 is: 420.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.16 : 540.96 = 304.80 : x
  2. Step 2: Convert to fraction form
    392.16/540.96 = 304.80/x
  3. Step 3: Cross multiply
    392.16x = 540.96 × 304.80
  4. Step 4: Simplify right side
    392.16x = 164,884.61
  5. Step 5: Solve for x
    x = 164,884.61/392.16
  6. Step 6: Final answer
    x = 420.45

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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.