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Finding the Fourth Proportional to 15,865.22, 21,893.06 and 8,693.70

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Solution

The fourth proportional to 15,865.22, 21,893.06 and 8,693.70 is: 11,996.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.22 : 21,893.06 = 8,693.70 : x
  2. Step 2: Convert to fraction form
    15,865.22/21,893.06 = 8,693.70/x
  3. Step 3: Cross multiply
    15,865.22x = 21,893.06 × 8,693.70
  4. Step 4: Simplify right side
    15,865.22x = 190,331,652.25
  5. Step 5: Solve for x
    x = 190,331,652.25/15,865.22
  6. Step 6: Final answer
    x = 11,996.79

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1.5x scale

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.