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Finding the Fourth Proportional to 392.96, 542.40 and 315.44

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Solution

The fourth proportional to 392.96, 542.40 and 315.44 is: 435.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.96 : 542.40 = 315.44 : x
  2. Step 2: Convert to fraction form
    392.96/542.40 = 315.44/x
  3. Step 3: Cross multiply
    392.96x = 542.40 × 315.44
  4. Step 4: Simplify right side
    392.96x = 171,094.66
  5. Step 5: Solve for x
    x = 171,094.66/392.96
  6. Step 6: Final answer
    x = 435.40

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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.