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Finding the Fourth Proportional to 20,921.52, 28,871.72 and 11,490.72

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Solution

The fourth proportional to 20,921.52, 28,871.72 and 11,490.72 is: 15,857.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.52 : 28,871.72 = 11,490.72 : x
  2. Step 2: Convert to fraction form
    20,921.52/28,871.72 = 11,490.72/x
  3. Step 3: Cross multiply
    20,921.52x = 28,871.72 × 11,490.72
  4. Step 4: Simplify right side
    20,921.52x = 331,756,850.44
  5. Step 5: Solve for x
    x = 331,756,850.44/20,921.52
  6. Step 6: Final answer
    x = 15,857.21

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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.