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Finding the Fourth Proportional to 511.60, 767.28 and 186.78

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Solution

The fourth proportional to 511.60, 767.28 and 186.78 is: 280.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.60 : 767.28 = 186.78 : x
  2. Step 2: Convert to fraction form
    511.60/767.28 = 186.78/x
  3. Step 3: Cross multiply
    511.60x = 767.28 × 186.78
  4. Step 4: Simplify right side
    511.60x = 143,312.56
  5. Step 5: Solve for x
    x = 143,312.56/511.60
  6. Step 6: Final answer
    x = 280.13

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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.