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Finding the Fourth Proportional to 15,861.58, 21,887.94 and 8,787.76

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Solution

The fourth proportional to 15,861.58, 21,887.94 and 8,787.76 is: 12,126.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.58 : 21,887.94 = 8,787.76 : x
  2. Step 2: Convert to fraction form
    15,861.58/21,887.94 = 8,787.76/x
  3. Step 3: Cross multiply
    15,861.58x = 21,887.94 × 8,787.76
  4. Step 4: Simplify right side
    15,861.58x = 192,345,963.61
  5. Step 5: Solve for x
    x = 192,345,963.61/15,861.58
  6. Step 6: Final answer
    x = 12,126.53

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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.