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Finding the Fourth Proportional to 66,428.80, 99,643.20 and 22,062.40

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Solution

The fourth proportional to 66,428.80, 99,643.20 and 22,062.40 is: 33,093.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.80 : 99,643.20 = 22,062.40 : x
  2. Step 2: Convert to fraction form
    66,428.80/99,643.20 = 22,062.40/x
  3. Step 3: Cross multiply
    66,428.80x = 99,643.20 × 22,062.40
  4. Step 4: Simplify right side
    66,428.80x = 2,198,368,135.68
  5. Step 5: Solve for x
    x = 2,198,368,135.68/66,428.80
  6. Step 6: Final answer
    x = 33,093.60

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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.