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Finding the Fourth Proportional to 772.78, 1,159.56 and 388

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Solution

The fourth proportional to 772.78, 1,159.56 and 388 is: 582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.78 : 1,159.56 = 388 : x
  2. Step 2: Convert to fraction form
    772.78/1,159.56 = 388/x
  3. Step 3: Cross multiply
    772.78x = 1,159.56 × 388
  4. Step 4: Simplify right side
    772.78x = 449,909.28
  5. Step 5: Solve for x
    x = 449,909.28/772.78
  6. Step 6: Final answer
    x = 582.20

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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.