Home / 20,686.76-28,548.74-12,191.40

Finding the Fourth Proportional to 20,686.76, 28,548.74 and 12,191.40

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Solution

The fourth proportional to 20,686.76, 28,548.74 and 12,191.40 is: 16,824.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.76 : 28,548.74 = 12,191.40 : x
  2. Step 2: Convert to fraction form
    20,686.76/28,548.74 = 12,191.40/x
  3. Step 3: Cross multiply
    20,686.76x = 28,548.74 × 12,191.40
  4. Step 4: Simplify right side
    20,686.76x = 348,049,108.84
  5. Step 5: Solve for x
    x = 348,049,108.84/20,686.76
  6. Step 6: Final answer
    x = 16,824.73

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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.