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Finding the Fourth Proportional to 15,860.86, 21,887.98 and 8,787.26

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Solution

The fourth proportional to 15,860.86, 21,887.98 and 8,787.26 is: 12,126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.86 : 21,887.98 = 8,787.26 : x
  2. Step 2: Convert to fraction form
    15,860.86/21,887.98 = 8,787.26/x
  3. Step 3: Cross multiply
    15,860.86x = 21,887.98 × 8,787.26
  4. Step 4: Simplify right side
    15,860.86x = 192,335,403.89
  5. Step 5: Solve for x
    x = 192,335,403.89/15,860.86
  6. Step 6: Final answer
    x = 12,126.42

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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.