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Finding the Fourth Proportional to 763.91, 1,145.86 and 186.78

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Solution

The fourth proportional to 763.91, 1,145.86 and 186.78 is: 280.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.91 : 1,145.86 = 186.78 : x
  2. Step 2: Convert to fraction form
    763.91/1,145.86 = 186.78/x
  3. Step 3: Cross multiply
    763.91x = 1,145.86 × 186.78
  4. Step 4: Simplify right side
    763.91x = 214,022.80
  5. Step 5: Solve for x
    x = 214,022.80/763.91
  6. Step 6: Final answer
    x = 280.17

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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.