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Finding the Fourth Proportional to 128,023.62, 191,972.25 and 39,255.72

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Solution

The fourth proportional to 128,023.62, 191,972.25 and 39,255.72 is: 58,864.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,023.62 : 191,972.25 = 39,255.72 : x
  2. Step 2: Convert to fraction form
    128,023.62/191,972.25 = 39,255.72/x
  3. Step 3: Cross multiply
    128,023.62x = 191,972.25 × 39,255.72
  4. Step 4: Simplify right side
    128,023.62x = 7,536,008,893.77
  5. Step 5: Solve for x
    x = 7,536,008,893.77/128,023.62
  6. Step 6: Final answer
    x = 58,864.21

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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.