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Finding the Fourth Proportional to 20,921.54, 28,871.72 and 11,490.71

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Solution

The fourth proportional to 20,921.54, 28,871.72 and 11,490.71 is: 15,857.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.54 : 28,871.72 = 11,490.71 : x
  2. Step 2: Convert to fraction form
    20,921.54/28,871.72 = 11,490.71/x
  3. Step 3: Cross multiply
    20,921.54x = 28,871.72 × 11,490.71
  4. Step 4: Simplify right side
    20,921.54x = 331,756,359.91
  5. Step 5: Solve for x
    x = 331,756,359.91/20,921.54
  6. Step 6: Final answer
    x = 15,857.17

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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.