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Finding the Fourth Proportional to 15,860.72, 21,887.81 and 8,787.13

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Solution

The fourth proportional to 15,860.72, 21,887.81 and 8,787.13 is: 12,126.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.72 : 21,887.81 = 8,787.13 : x
  2. Step 2: Convert to fraction form
    15,860.72/21,887.81 = 8,787.13/x
  3. Step 3: Cross multiply
    15,860.72x = 21,887.81 × 8,787.13
  4. Step 4: Simplify right side
    15,860.72x = 192,331,031.89
  5. Step 5: Solve for x
    x = 192,331,031.89/15,860.72
  6. Step 6: Final answer
    x = 12,126.25

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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.