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Finding the Fourth Proportional to 780.88, 1,171.20 and 293.86

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Solution

The fourth proportional to 780.88, 1,171.20 and 293.86 is: 440.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.88 : 1,171.20 = 293.86 : x
  2. Step 2: Convert to fraction form
    780.88/1,171.20 = 293.86/x
  3. Step 3: Cross multiply
    780.88x = 1,171.20 × 293.86
  4. Step 4: Simplify right side
    780.88x = 344,168.83
  5. Step 5: Solve for x
    x = 344,168.83/780.88
  6. Step 6: Final answer
    x = 440.74

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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.