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Finding the Fourth Proportional to 99,761.75, 149,670.75 and 40,639.85

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Solution

The fourth proportional to 99,761.75, 149,670.75 and 40,639.85 is: 60,971.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,761.75 : 149,670.75 = 40,639.85 : x
  2. Step 2: Convert to fraction form
    99,761.75/149,670.75 = 40,639.85/x
  3. Step 3: Cross multiply
    99,761.75x = 149,670.75 × 40,639.85
  4. Step 4: Simplify right side
    99,761.75x = 6,082,596,829.39
  5. Step 5: Solve for x
    x = 6,082,596,829.39/99,761.75
  6. Step 6: Final answer
    x = 60,971.23

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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.