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Finding the Fourth Proportional to 388.80, 583.20 and 235.44

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Solution

The fourth proportional to 388.80, 583.20 and 235.44 is: 353.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.80 : 583.20 = 235.44 : x
  2. Step 2: Convert to fraction form
    388.80/583.20 = 235.44/x
  3. Step 3: Cross multiply
    388.80x = 583.20 × 235.44
  4. Step 4: Simplify right side
    388.80x = 137,308.61
  5. Step 5: Solve for x
    x = 137,308.61/388.80
  6. Step 6: Final answer
    x = 353.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.