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Finding the Fourth Proportional to 15,886.21, 21,923.69 and 8,812.64

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Solution

The fourth proportional to 15,886.21, 21,923.69 and 8,812.64 is: 12,161.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.21 : 21,923.69 = 8,812.64 : x
  2. Step 2: Convert to fraction form
    15,886.21/21,923.69 = 8,812.64/x
  3. Step 3: Cross multiply
    15,886.21x = 21,923.69 × 8,812.64
  4. Step 4: Simplify right side
    15,886.21x = 193,205,587.44
  5. Step 5: Solve for x
    x = 193,205,587.44/15,886.21
  6. Step 6: Final answer
    x = 12,161.84

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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.