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Finding the Fourth Proportional to 20,368.56, 28,106.16 and 11,872.56

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Solution

The fourth proportional to 20,368.56, 28,106.16 and 11,872.56 is: 16,382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,368.56 : 28,106.16 = 11,872.56 : x
  2. Step 2: Convert to fraction form
    20,368.56/28,106.16 = 11,872.56/x
  3. Step 3: Cross multiply
    20,368.56x = 28,106.16 × 11,872.56
  4. Step 4: Simplify right side
    20,368.56x = 333,692,070.97
  5. Step 5: Solve for x
    x = 333,692,070.97/20,368.56
  6. Step 6: Final answer
    x = 16,382.70

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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.