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Finding the Fourth Proportional to 20,766.21, 28,661.04 and 12,267.78

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Solution

The fourth proportional to 20,766.21, 28,661.04 and 12,267.78 is: 16,931.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,766.21 : 28,661.04 = 12,267.78 : x
  2. Step 2: Convert to fraction form
    20,766.21/28,661.04 = 12,267.78/x
  3. Step 3: Cross multiply
    20,766.21x = 28,661.04 × 12,267.78
  4. Step 4: Simplify right side
    20,766.21x = 351,607,333.29
  5. Step 5: Solve for x
    x = 351,607,333.29/20,766.21
  6. Step 6: Final answer
    x = 16,931.70

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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.