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Finding the Fourth Proportional to 1,865.18, 2,795.88 and 768.80

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Solution

The fourth proportional to 1,865.18, 2,795.88 and 768.80 is: 1,152.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.18 : 2,795.88 = 768.80 : x
  2. Step 2: Convert to fraction form
    1,865.18/2,795.88 = 768.80/x
  3. Step 3: Cross multiply
    1,865.18x = 2,795.88 × 768.80
  4. Step 4: Simplify right side
    1,865.18x = 2,149,472.54
  5. Step 5: Solve for x
    x = 2,149,472.54/1,865.18
  6. Step 6: Final answer
    x = 1,152.42

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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.