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Finding the Fourth Proportional to 2,872.78, 4,309.34 and 898.70

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Solution

The fourth proportional to 2,872.78, 4,309.34 and 898.70 is: 1,348.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,872.78 : 4,309.34 = 898.70 : x
  2. Step 2: Convert to fraction form
    2,872.78/4,309.34 = 898.70/x
  3. Step 3: Cross multiply
    2,872.78x = 4,309.34 × 898.70
  4. Step 4: Simplify right side
    2,872.78x = 3,872,777.82
  5. Step 5: Solve for x
    x = 3,872,777.82/2,872.78
  6. Step 6: Final answer
    x = 1,348.10

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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.