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Finding the Fourth Proportional to 21,008.80, 31,480.80 and 18,222.40

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Solution

The fourth proportional to 21,008.80, 31,480.80 and 18,222.40 is: 27,305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.80 : 31,480.80 = 18,222.40 : x
  2. Step 2: Convert to fraction form
    21,008.80/31,480.80 = 18,222.40/x
  3. Step 3: Cross multiply
    21,008.80x = 31,480.80 × 18,222.40
  4. Step 4: Simplify right side
    21,008.80x = 573,655,729.92
  5. Step 5: Solve for x
    x = 573,655,729.92/21,008.80
  6. Step 6: Final answer
    x = 27,305.50

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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.