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Finding the Fourth Proportional to 128.34, 191.48 and 116.55

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Solution

The fourth proportional to 128.34, 191.48 and 116.55 is: 173.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.34 : 191.48 = 116.55 : x
  2. Step 2: Convert to fraction form
    128.34/191.48 = 116.55/x
  3. Step 3: Cross multiply
    128.34x = 191.48 × 116.55
  4. Step 4: Simplify right side
    128.34x = 22,316.41
  5. Step 5: Solve for x
    x = 22,316.41/128.34
  6. Step 6: Final answer
    x = 173.89

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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.