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Finding the Fourth Proportional to 72,389.70, 108,517.32 and 28,045.44

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Solution

The fourth proportional to 72,389.70, 108,517.32 and 28,045.44 is: 42,042.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,389.70 : 108,517.32 = 28,045.44 : x
  2. Step 2: Convert to fraction form
    72,389.70/108,517.32 = 28,045.44/x
  3. Step 3: Cross multiply
    72,389.70x = 108,517.32 × 28,045.44
  4. Step 4: Simplify right side
    72,389.70x = 3,043,415,987.02
  5. Step 5: Solve for x
    x = 3,043,415,987.02/72,389.70
  6. Step 6: Final answer
    x = 42,042.11

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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.