Home / 20,931.96-28,886.18-11,979.61

Finding the Fourth Proportional to 20,931.96, 28,886.18 and 11,979.61

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Solution

The fourth proportional to 20,931.96, 28,886.18 and 11,979.61 is: 16,531.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.96 : 28,886.18 = 11,979.61 : x
  2. Step 2: Convert to fraction form
    20,931.96/28,886.18 = 11,979.61/x
  3. Step 3: Cross multiply
    20,931.96x = 28,886.18 × 11,979.61
  4. Step 4: Simplify right side
    20,931.96x = 346,045,170.79
  5. Step 5: Solve for x
    x = 346,045,170.79/20,931.96
  6. Step 6: Final answer
    x = 16,531.90

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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.