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Finding the Fourth Proportional to 20,311.21, 28,032.08 and 11,359.21

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Solution

The fourth proportional to 20,311.21, 28,032.08 and 11,359.21 is: 15,677.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,311.21 : 28,032.08 = 11,359.21 : x
  2. Step 2: Convert to fraction form
    20,311.21/28,032.08 = 11,359.21/x
  3. Step 3: Cross multiply
    20,311.21x = 28,032.08 × 11,359.21
  4. Step 4: Simplify right side
    20,311.21x = 318,422,283.46
  5. Step 5: Solve for x
    x = 318,422,283.46/20,311.21
  6. Step 6: Final answer
    x = 15,677.17

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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.