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Finding the Fourth Proportional to 128,257.78, 192,430.41 and 69,099.52

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Solution

The fourth proportional to 128,257.78, 192,430.41 and 69,099.52 is: 103,672.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.78 : 192,430.41 = 69,099.52 : x
  2. Step 2: Convert to fraction form
    128,257.78/192,430.41 = 69,099.52/x
  3. Step 3: Cross multiply
    128,257.78x = 192,430.41 × 69,099.52
  4. Step 4: Simplify right side
    128,257.78x = 13,296,848,964.40
  5. Step 5: Solve for x
    x = 13,296,848,964.40/128,257.78
  6. Step 6: Final answer
    x = 103,672.85

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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.