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Finding the Fourth Proportional to 15,879.66, 21,913.68 and 8,806.20

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Solution

The fourth proportional to 15,879.66, 21,913.68 and 8,806.20 is: 12,152.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.66 : 21,913.68 = 8,806.20 : x
  2. Step 2: Convert to fraction form
    15,879.66/21,913.68 = 8,806.20/x
  3. Step 3: Cross multiply
    15,879.66x = 21,913.68 × 8,806.20
  4. Step 4: Simplify right side
    15,879.66x = 192,976,248.82
  5. Step 5: Solve for x
    x = 192,976,248.82/15,879.66
  6. Step 6: Final answer
    x = 12,152.42

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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.