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Finding the Fourth Proportional to 772.78, 1,159.20 and 252.77

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Solution

The fourth proportional to 772.78, 1,159.20 and 252.77 is: 379.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.78 : 1,159.20 = 252.77 : x
  2. Step 2: Convert to fraction form
    772.78/1,159.20 = 252.77/x
  3. Step 3: Cross multiply
    772.78x = 1,159.20 × 252.77
  4. Step 4: Simplify right side
    772.78x = 293,014.38
  5. Step 5: Solve for x
    x = 293,014.38/772.78
  6. Step 6: Final answer
    x = 379.17

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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.