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Finding the Fourth Proportional to 15,015, 20,720.70 and 8,391

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Solution

The fourth proportional to 15,015, 20,720.70 and 8,391 is: 11,579.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015 : 20,720.70 = 8,391 : x
  2. Step 2: Convert to fraction form
    15,015/20,720.70 = 8,391/x
  3. Step 3: Cross multiply
    15,015x = 20,720.70 × 8,391
  4. Step 4: Simplify right side
    15,015x = 173,867,393.70
  5. Step 5: Solve for x
    x = 173,867,393.70/15,015
  6. Step 6: Final answer
    x = 11,579.58

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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.