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Finding the Fourth Proportional to 20,873.68, 28,811.12 and 12,911.27

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Solution

The fourth proportional to 20,873.68, 28,811.12 and 12,911.27 is: 17,820.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.68 : 28,811.12 = 12,911.27 : x
  2. Step 2: Convert to fraction form
    20,873.68/28,811.12 = 12,911.27/x
  3. Step 3: Cross multiply
    20,873.68x = 28,811.12 × 12,911.27
  4. Step 4: Simplify right side
    20,873.68x = 371,988,084.77
  5. Step 5: Solve for x
    x = 371,988,084.77/20,873.68
  6. Step 6: Final answer
    x = 17,820.92

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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.