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Finding the Fourth Proportional to 780.70, 1,171.25 and 293.75

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Solution

The fourth proportional to 780.70, 1,171.25 and 293.75 is: 440.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.70 : 1,171.25 = 293.75 : x
  2. Step 2: Convert to fraction form
    780.70/1,171.25 = 293.75/x
  3. Step 3: Cross multiply
    780.70x = 1,171.25 × 293.75
  4. Step 4: Simplify right side
    780.70x = 344,053.22
  5. Step 5: Solve for x
    x = 344,053.22/780.70
  6. Step 6: Final answer
    x = 440.70

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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.