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Finding the Fourth Proportional to 15,811.56, 21,818.64 and 8,737.98

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Solution

The fourth proportional to 15,811.56, 21,818.64 and 8,737.98 is: 12,057.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.56 : 21,818.64 = 8,737.98 : x
  2. Step 2: Convert to fraction form
    15,811.56/21,818.64 = 8,737.98/x
  3. Step 3: Cross multiply
    15,811.56x = 21,818.64 × 8,737.98
  4. Step 4: Simplify right side
    15,811.56x = 190,650,839.95
  5. Step 5: Solve for x
    x = 190,650,839.95/15,811.56
  6. Step 6: Final answer
    x = 12,057.69

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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.