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Finding the Fourth Proportional to 15,572.78, 21,489.77 and 8,857.46

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Solution

The fourth proportional to 15,572.78, 21,489.77 and 8,857.46 is: 12,222.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,572.78 : 21,489.77 = 8,857.46 : x
  2. Step 2: Convert to fraction form
    15,572.78/21,489.77 = 8,857.46/x
  3. Step 3: Cross multiply
    15,572.78x = 21,489.77 × 8,857.46
  4. Step 4: Simplify right side
    15,572.78x = 190,344,733.90
  5. Step 5: Solve for x
    x = 190,344,733.90/15,572.78
  6. Step 6: Final answer
    x = 12,222.91

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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.