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Finding the Fourth Proportional to 525.80, 787.37 and 388.95

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Solution

The fourth proportional to 525.80, 787.37 and 388.95 is: 582.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.80 : 787.37 = 388.95 : x
  2. Step 2: Convert to fraction form
    525.80/787.37 = 388.95/x
  3. Step 3: Cross multiply
    525.80x = 787.37 × 388.95
  4. Step 4: Simplify right side
    525.80x = 306,245.62
  5. Step 5: Solve for x
    x = 306,245.62/525.80
  6. Step 6: Final answer
    x = 582.44

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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.