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Finding the Fourth Proportional to 15,891.81, 21,931.19 and 8,818.89

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Solution

The fourth proportional to 15,891.81, 21,931.19 and 8,818.89 is: 12,170.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.81 : 21,931.19 = 8,818.89 : x
  2. Step 2: Convert to fraction form
    15,891.81/21,931.19 = 8,818.89/x
  3. Step 3: Cross multiply
    15,891.81x = 21,931.19 × 8,818.89
  4. Step 4: Simplify right side
    15,891.81x = 193,408,752.18
  5. Step 5: Solve for x
    x = 193,408,752.18/15,891.81
  6. Step 6: Final answer
    x = 12,170.34

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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.