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Finding the Fourth Proportional to 21,901.40, 32,860.20 and 21,091.40

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Solution

The fourth proportional to 21,901.40, 32,860.20 and 21,091.40 is: 31,644.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,901.40 : 32,860.20 = 21,091.40 : x
  2. Step 2: Convert to fraction form
    21,901.40/32,860.20 = 21,091.40/x
  3. Step 3: Cross multiply
    21,901.40x = 32,860.20 × 21,091.40
  4. Step 4: Simplify right side
    21,901.40x = 693,067,622.28
  5. Step 5: Solve for x
    x = 693,067,622.28/21,901.40
  6. Step 6: Final answer
    x = 31,644.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.