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Finding the Fourth Proportional to 3,212.50, 4,818.75 and 780.50

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Solution

The fourth proportional to 3,212.50, 4,818.75 and 780.50 is: 1,170.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,212.50 : 4,818.75 = 780.50 : x
  2. Step 2: Convert to fraction form
    3,212.50/4,818.75 = 780.50/x
  3. Step 3: Cross multiply
    3,212.50x = 4,818.75 × 780.50
  4. Step 4: Simplify right side
    3,212.50x = 3,761,034.38
  5. Step 5: Solve for x
    x = 3,761,034.38/3,212.50
  6. Step 6: Final answer
    x = 1,170.75

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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.