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Finding the Fourth Proportional to 15,863.78, 21,892.20 and 8,790.32

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Solution

The fourth proportional to 15,863.78, 21,892.20 and 8,790.32 is: 12,130.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,863.78 : 21,892.20 = 8,790.32 : x
  2. Step 2: Convert to fraction form
    15,863.78/21,892.20 = 8,790.32/x
  3. Step 3: Cross multiply
    15,863.78x = 21,892.20 × 8,790.32
  4. Step 4: Simplify right side
    15,863.78x = 192,439,443.50
  5. Step 5: Solve for x
    x = 192,439,443.50/15,863.78
  6. Step 6: Final answer
    x = 12,130.74

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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.