Home / 20,957.28-28,921.40-12,005.57

Finding the Fourth Proportional to 20,957.28, 28,921.40 and 12,005.57

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Solution

The fourth proportional to 20,957.28, 28,921.40 and 12,005.57 is: 16,567.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.28 : 28,921.40 = 12,005.57 : x
  2. Step 2: Convert to fraction form
    20,957.28/28,921.40 = 12,005.57/x
  3. Step 3: Cross multiply
    20,957.28x = 28,921.40 × 12,005.57
  4. Step 4: Simplify right side
    20,957.28x = 347,217,777.60
  5. Step 5: Solve for x
    x = 347,217,777.60/20,957.28
  6. Step 6: Final answer
    x = 16,567.88

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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.