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Finding the Fourth Proportional to 15,892.48, 21,931.64 and 8,818.90

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Solution

The fourth proportional to 15,892.48, 21,931.64 and 8,818.90 is: 12,170.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,892.48 : 21,931.64 = 8,818.90 : x
  2. Step 2: Convert to fraction form
    15,892.48/21,931.64 = 8,818.90/x
  3. Step 3: Cross multiply
    15,892.48x = 21,931.64 × 8,818.90
  4. Step 4: Simplify right side
    15,892.48x = 193,412,940.00
  5. Step 5: Solve for x
    x = 193,412,940.00/15,892.48
  6. Step 6: Final answer
    x = 12,170.09

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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.