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Finding the Fourth Proportional to 521.78, 782.43 and 197.15

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Solution

The fourth proportional to 521.78, 782.43 and 197.15 is: 295.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.78 : 782.43 = 197.15 : x
  2. Step 2: Convert to fraction form
    521.78/782.43 = 197.15/x
  3. Step 3: Cross multiply
    521.78x = 782.43 × 197.15
  4. Step 4: Simplify right side
    521.78x = 154,256.07
  5. Step 5: Solve for x
    x = 154,256.07/521.78
  6. Step 6: Final answer
    x = 295.63

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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.