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Finding the Fourth Proportional to 98,108.87, 135,353.91 and 61,800.57

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Solution

The fourth proportional to 98,108.87, 135,353.91 and 61,800.57 is: 85,261.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,108.87 : 135,353.91 = 61,800.57 : x
  2. Step 2: Convert to fraction form
    98,108.87/135,353.91 = 61,800.57/x
  3. Step 3: Cross multiply
    98,108.87x = 135,353.91 × 61,800.57
  4. Step 4: Simplify right side
    98,108.87x = 8,364,948,847.67
  5. Step 5: Solve for x
    x = 8,364,948,847.67/98,108.87
  6. Step 6: Final answer
    x = 85,261.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.