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Finding the Fourth Proportional to 15,860.76, 21,888.63 and 8,787.21

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Solution

The fourth proportional to 15,860.76, 21,888.63 and 8,787.21 is: 12,126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.76 : 21,888.63 = 8,787.21 : x
  2. Step 2: Convert to fraction form
    15,860.76/21,888.63 = 8,787.21/x
  3. Step 3: Cross multiply
    15,860.76x = 21,888.63 × 8,787.21
  4. Step 4: Simplify right side
    15,860.76x = 192,339,988.42
  5. Step 5: Solve for x
    x = 192,339,988.42/15,860.76
  6. Step 6: Final answer
    x = 12,126.78

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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.