Home / 20,871.12-28,811.16-12,486

Finding the Fourth Proportional to 20,871.12, 28,811.16 and 12,486

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Solution

The fourth proportional to 20,871.12, 28,811.16 and 12,486 is: 17,236.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.12 : 28,811.16 = 12,486 : x
  2. Step 2: Convert to fraction form
    20,871.12/28,811.16 = 12,486/x
  3. Step 3: Cross multiply
    20,871.12x = 28,811.16 × 12,486
  4. Step 4: Simplify right side
    20,871.12x = 359,736,143.76
  5. Step 5: Solve for x
    x = 359,736,143.76/20,871.12
  6. Step 6: Final answer
    x = 17,236.07

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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.