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Finding the Fourth Proportional to 15,862.32, 21,890.34 and 8,789.22

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Solution

The fourth proportional to 15,862.32, 21,890.34 and 8,789.22 is: 12,129.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,862.32 : 21,890.34 = 8,789.22 : x
  2. Step 2: Convert to fraction form
    15,862.32/21,890.34 = 8,789.22/x
  3. Step 3: Cross multiply
    15,862.32x = 21,890.34 × 8,789.22
  4. Step 4: Simplify right side
    15,862.32x = 192,399,014.13
  5. Step 5: Solve for x
    x = 192,399,014.13/15,862.32
  6. Step 6: Final answer
    x = 12,129.31

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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.