Home / 20,872.12-28,807.22-15,827.84

Finding the Fourth Proportional to 20,872.12, 28,807.22 and 15,827.84

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Solution

The fourth proportional to 20,872.12, 28,807.22 and 15,827.84 is: 21,845.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.12 : 28,807.22 = 15,827.84 : x
  2. Step 2: Convert to fraction form
    20,872.12/28,807.22 = 15,827.84/x
  3. Step 3: Cross multiply
    20,872.12x = 28,807.22 × 15,827.84
  4. Step 4: Simplify right side
    20,872.12x = 455,956,069.00
  5. Step 5: Solve for x
    x = 455,956,069.00/20,872.12
  6. Step 6: Final answer
    x = 21,845.22

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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.