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Finding the Fourth Proportional to 51,247, 70,720.98 and 28,891

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Solution

The fourth proportional to 51,247, 70,720.98 and 28,891 is: 39,869.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,247 : 70,720.98 = 28,891 : x
  2. Step 2: Convert to fraction form
    51,247/70,720.98 = 28,891/x
  3. Step 3: Cross multiply
    51,247x = 70,720.98 × 28,891
  4. Step 4: Simplify right side
    51,247x = 2,043,199,833.18
  5. Step 5: Solve for x
    x = 2,043,199,833.18/51,247
  6. Step 6: Final answer
    x = 39,869.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.