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Finding the Fourth Proportional to 15,886.14, 21,921.89 and 8,812.41

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Solution

The fourth proportional to 15,886.14, 21,921.89 and 8,812.41 is: 12,160.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.14 : 21,921.89 = 8,812.41 : x
  2. Step 2: Convert to fraction form
    15,886.14/21,921.89 = 8,812.41/x
  3. Step 3: Cross multiply
    15,886.14x = 21,921.89 × 8,812.41
  4. Step 4: Simplify right side
    15,886.14x = 193,184,638.59
  5. Step 5: Solve for x
    x = 193,184,638.59/15,886.14
  6. Step 6: Final answer
    x = 12,160.58

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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.