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Finding the Fourth Proportional to 783.78, 1,175.78 and 263.56

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Solution

The fourth proportional to 783.78, 1,175.78 and 263.56 is: 395.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.78 : 1,175.78 = 263.56 : x
  2. Step 2: Convert to fraction form
    783.78/1,175.78 = 263.56/x
  3. Step 3: Cross multiply
    783.78x = 1,175.78 × 263.56
  4. Step 4: Simplify right side
    783.78x = 309,884.32
  5. Step 5: Solve for x
    x = 309,884.32/783.78
  6. Step 6: Final answer
    x = 395.37

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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.