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Finding the Fourth Proportional to 15,886.87, 21,923.31 and 8,813.95

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Solution

The fourth proportional to 15,886.87, 21,923.31 and 8,813.95 is: 12,162.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.87 : 21,923.31 = 8,813.95 : x
  2. Step 2: Convert to fraction form
    15,886.87/21,923.31 = 8,813.95/x
  3. Step 3: Cross multiply
    15,886.87x = 21,923.31 × 8,813.95
  4. Step 4: Simplify right side
    15,886.87x = 193,230,958.17
  5. Step 5: Solve for x
    x = 193,230,958.17/15,886.87
  6. Step 6: Final answer
    x = 12,162.93

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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.