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Finding the Fourth Proportional to 28,308.88, 42,422.94 and 20,854.72

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Solution

The fourth proportional to 28,308.88, 42,422.94 and 20,854.72 is: 31,252.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,308.88 : 42,422.94 = 20,854.72 : x
  2. Step 2: Convert to fraction form
    28,308.88/42,422.94 = 20,854.72/x
  3. Step 3: Cross multiply
    28,308.88x = 42,422.94 × 20,854.72
  4. Step 4: Simplify right side
    28,308.88x = 884,718,535.28
  5. Step 5: Solve for x
    x = 884,718,535.28/28,308.88
  6. Step 6: Final answer
    x = 31,252.33

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