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Finding the Fourth Proportional to 128,439.70, 192,659.82 and 69,303.22

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Solution

The fourth proportional to 128,439.70, 192,659.82 and 69,303.22 is: 103,954.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.70 : 192,659.82 = 69,303.22 : x
  2. Step 2: Convert to fraction form
    128,439.70/192,659.82 = 69,303.22/x
  3. Step 3: Cross multiply
    128,439.70x = 192,659.82 × 69,303.22
  4. Step 4: Simplify right side
    128,439.70x = 13,351,945,890.62
  5. Step 5: Solve for x
    x = 13,351,945,890.62/128,439.70
  6. Step 6: Final answer
    x = 103,954.98

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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.