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Finding the Fourth Proportional to 15,705.78, 21,673.17 and 8,632.45

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Solution

The fourth proportional to 15,705.78, 21,673.17 and 8,632.45 is: 11,912.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,705.78 : 21,673.17 = 8,632.45 : x
  2. Step 2: Convert to fraction form
    15,705.78/21,673.17 = 8,632.45/x
  3. Step 3: Cross multiply
    15,705.78x = 21,673.17 × 8,632.45
  4. Step 4: Simplify right side
    15,705.78x = 187,092,556.37
  5. Step 5: Solve for x
    x = 187,092,556.37/15,705.78
  6. Step 6: Final answer
    x = 11,912.34

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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.