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Finding the Fourth Proportional to 21,931.40, 32,921.40 and 13,620.80

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Solution

The fourth proportional to 21,931.40, 32,921.40 and 13,620.80 is: 20,446.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,931.40 : 32,921.40 = 13,620.80 : x
  2. Step 2: Convert to fraction form
    21,931.40/32,921.40 = 13,620.80/x
  3. Step 3: Cross multiply
    21,931.40x = 32,921.40 × 13,620.80
  4. Step 4: Simplify right side
    21,931.40x = 448,415,805.12
  5. Step 5: Solve for x
    x = 448,415,805.12/21,931.40
  6. Step 6: Final answer
    x = 20,446.29

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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.