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Finding the Fourth Proportional to 780.77, 1,171.15 and 293.86

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Solution

The fourth proportional to 780.77, 1,171.15 and 293.86 is: 440.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.77 : 1,171.15 = 293.86 : x
  2. Step 2: Convert to fraction form
    780.77/1,171.15 = 293.86/x
  3. Step 3: Cross multiply
    780.77x = 1,171.15 × 293.86
  4. Step 4: Simplify right side
    780.77x = 344,148.28
  5. Step 5: Solve for x
    x = 344,148.28/780.77
  6. Step 6: Final answer
    x = 440.78

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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.