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Finding the Fourth Proportional to 15,863.18, 21,890.16 and 8,693.00

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Solution

The fourth proportional to 15,863.18, 21,890.16 and 8,693.00 is: 11,995.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,863.18 : 21,890.16 = 8,693.00 : x
  2. Step 2: Convert to fraction form
    15,863.18/21,890.16 = 8,693.00/x
  3. Step 3: Cross multiply
    15,863.18x = 21,890.16 × 8,693.00
  4. Step 4: Simplify right side
    15,863.18x = 190,291,133.52
  5. Step 5: Solve for x
    x = 190,291,133.52/15,863.18
  6. Step 6: Final answer
    x = 11,995.78

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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.