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Finding the Fourth Proportional to 87,311.80, 130,986.90 and 28,137.40

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Solution

The fourth proportional to 87,311.80, 130,986.90 and 28,137.40 is: 42,212.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,311.80 : 130,986.90 = 28,137.40 : x
  2. Step 2: Convert to fraction form
    87,311.80/130,986.90 = 28,137.40/x
  3. Step 3: Cross multiply
    87,311.80x = 130,986.90 × 28,137.40
  4. Step 4: Simplify right side
    87,311.80x = 3,685,630,800.06
  5. Step 5: Solve for x
    x = 3,685,630,800.06/87,311.80
  6. Step 6: Final answer
    x = 42,212.29

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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.