Home / 20,489.68-28,276.16-12,106.20

Finding the Fourth Proportional to 20,489.68, 28,276.16 and 12,106.20

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Solution

The fourth proportional to 20,489.68, 28,276.16 and 12,106.20 is: 16,706.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.68 : 28,276.16 = 12,106.20 : x
  2. Step 2: Convert to fraction form
    20,489.68/28,276.16 = 12,106.20/x
  3. Step 3: Cross multiply
    20,489.68x = 28,276.16 × 12,106.20
  4. Step 4: Simplify right side
    20,489.68x = 342,316,848.19
  5. Step 5: Solve for x
    x = 342,316,848.19/20,489.68
  6. Step 6: Final answer
    x = 16,706.79

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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.