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Finding the Fourth Proportional to 20,859.86, 28,787.07 and 11,907.18

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Solution

The fourth proportional to 20,859.86, 28,787.07 and 11,907.18 is: 16,432.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.86 : 28,787.07 = 11,907.18 : x
  2. Step 2: Convert to fraction form
    20,859.86/28,787.07 = 11,907.18/x
  3. Step 3: Cross multiply
    20,859.86x = 28,787.07 × 11,907.18
  4. Step 4: Simplify right side
    20,859.86x = 342,772,824.16
  5. Step 5: Solve for x
    x = 342,772,824.16/20,859.86
  6. Step 6: Final answer
    x = 16,432.18

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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.