Home / 20,921.76-28,885.68-12,975.66

Finding the Fourth Proportional to 20,921.76, 28,885.68 and 12,975.66

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Solution

The fourth proportional to 20,921.76, 28,885.68 and 12,975.66 is: 17,914.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.76 : 28,885.68 = 12,975.66 : x
  2. Step 2: Convert to fraction form
    20,921.76/28,885.68 = 12,975.66/x
  3. Step 3: Cross multiply
    20,921.76x = 28,885.68 × 12,975.66
  4. Step 4: Simplify right side
    20,921.76x = 374,810,762.55
  5. Step 5: Solve for x
    x = 374,810,762.55/20,921.76
  6. Step 6: Final answer
    x = 17,914.88

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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.