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Finding the Fourth Proportional to 20,387, 28,134.12 and 11,894.96

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Solution

The fourth proportional to 20,387, 28,134.12 and 11,894.96 is: 16,415.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387 : 28,134.12 = 11,894.96 : x
  2. Step 2: Convert to fraction form
    20,387/28,134.12 = 11,894.96/x
  3. Step 3: Cross multiply
    20,387x = 28,134.12 × 11,894.96
  4. Step 4: Simplify right side
    20,387x = 334,654,232.04
  5. Step 5: Solve for x
    x = 334,654,232.04/20,387
  6. Step 6: Final answer
    x = 16,415.08

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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.