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Finding the Fourth Proportional to 128.73, 193.14 and 64.59

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Solution

The fourth proportional to 128.73, 193.14 and 64.59 is: 96.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.73 : 193.14 = 64.59 : x
  2. Step 2: Convert to fraction form
    128.73/193.14 = 64.59/x
  3. Step 3: Cross multiply
    128.73x = 193.14 × 64.59
  4. Step 4: Simplify right side
    128.73x = 12,474.91
  5. Step 5: Solve for x
    x = 12,474.91/128.73
  6. Step 6: Final answer
    x = 96.91

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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.