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Finding the Fourth Proportional to 28,661.90, 42,906.45 and 25,205.90

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Solution

The fourth proportional to 28,661.90, 42,906.45 and 25,205.90 is: 37,732.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,661.90 : 42,906.45 = 25,205.90 : x
  2. Step 2: Convert to fraction form
    28,661.90/42,906.45 = 25,205.90/x
  3. Step 3: Cross multiply
    28,661.90x = 42,906.45 × 25,205.90
  4. Step 4: Simplify right side
    28,661.90x = 1,081,495,688.06
  5. Step 5: Solve for x
    x = 1,081,495,688.06/28,661.90
  6. Step 6: Final answer
    x = 37,732.87

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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.