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Finding the Fourth Proportional to 15,891.90, 21,931.05 and 8,818.77

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Solution

The fourth proportional to 15,891.90, 21,931.05 and 8,818.77 is: 12,170.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.90 : 21,931.05 = 8,818.77 : x
  2. Step 2: Convert to fraction form
    15,891.90/21,931.05 = 8,818.77/x
  3. Step 3: Cross multiply
    15,891.90x = 21,931.05 × 8,818.77
  4. Step 4: Simplify right side
    15,891.90x = 193,405,001.12
  5. Step 5: Solve for x
    x = 193,405,001.12/15,891.90
  6. Step 6: Final answer
    x = 12,170.04

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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.