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Finding the Fourth Proportional to 99,138.67, 148,708.10 and 81,571.57

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Solution

The fourth proportional to 99,138.67, 148,708.10 and 81,571.57 is: 122,357.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,138.67 : 148,708.10 = 81,571.57 : x
  2. Step 2: Convert to fraction form
    99,138.67/148,708.10 = 81,571.57/x
  3. Step 3: Cross multiply
    99,138.67x = 148,708.10 × 81,571.57
  4. Step 4: Simplify right side
    99,138.67x = 12,130,353,188.72
  5. Step 5: Solve for x
    x = 12,130,353,188.72/99,138.67
  6. Step 6: Final answer
    x = 122,357.43

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1.5x scale

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.