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Finding the Fourth Proportional to 128.03, 191.34 and 93.56

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Solution

The fourth proportional to 128.03, 191.34 and 93.56 is: 139.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.03 : 191.34 = 93.56 : x
  2. Step 2: Convert to fraction form
    128.03/191.34 = 93.56/x
  3. Step 3: Cross multiply
    128.03x = 191.34 × 93.56
  4. Step 4: Simplify right side
    128.03x = 17,901.77
  5. Step 5: Solve for x
    x = 17,901.77/128.03
  6. Step 6: Final answer
    x = 139.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.