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Finding the Fourth Proportional to 511.78, 767.78 and 187.10

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Solution

The fourth proportional to 511.78, 767.78 and 187.10 is: 280.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.78 : 767.78 = 187.10 : x
  2. Step 2: Convert to fraction form
    511.78/767.78 = 187.10/x
  3. Step 3: Cross multiply
    511.78x = 767.78 × 187.10
  4. Step 4: Simplify right side
    511.78x = 143,651.64
  5. Step 5: Solve for x
    x = 143,651.64/511.78
  6. Step 6: Final answer
    x = 280.69

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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.