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Finding the Fourth Proportional to 2,820.76, 4,231.66 and 872.50

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Solution

The fourth proportional to 2,820.76, 4,231.66 and 872.50 is: 1,308.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.76 : 4,231.66 = 872.50 : x
  2. Step 2: Convert to fraction form
    2,820.76/4,231.66 = 872.50/x
  3. Step 3: Cross multiply
    2,820.76x = 4,231.66 × 872.50
  4. Step 4: Simplify right side
    2,820.76x = 3,692,123.35
  5. Step 5: Solve for x
    x = 3,692,123.35/2,820.76
  6. Step 6: Final answer
    x = 1,308.91

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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.