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Finding the Fourth Proportional to 135.42, 186.80 and 93.98

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Solution

The fourth proportional to 135.42, 186.80 and 93.98 is: 129.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.42 : 186.80 = 93.98 : x
  2. Step 2: Convert to fraction form
    135.42/186.80 = 93.98/x
  3. Step 3: Cross multiply
    135.42x = 186.80 × 93.98
  4. Step 4: Simplify right side
    135.42x = 17,555.46
  5. Step 5: Solve for x
    x = 17,555.46/135.42
  6. Step 6: Final answer
    x = 129.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.