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Finding the Fourth Proportional to 58,540.80, 87,811.20 and 28,979.40

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Solution

The fourth proportional to 58,540.80, 87,811.20 and 28,979.40 is: 43,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,540.80 : 87,811.20 = 28,979.40 : x
  2. Step 2: Convert to fraction form
    58,540.80/87,811.20 = 28,979.40/x
  3. Step 3: Cross multiply
    58,540.80x = 87,811.20 × 28,979.40
  4. Step 4: Simplify right side
    58,540.80x = 2,544,715,889.28
  5. Step 5: Solve for x
    x = 2,544,715,889.28/58,540.80
  6. Step 6: Final answer
    x = 43,469.10

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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.