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Finding the Fourth Proportional to 193.42, 289.93 and 90.77

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Solution

The fourth proportional to 193.42, 289.93 and 90.77 is: 136.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.42 : 289.93 = 90.77 : x
  2. Step 2: Convert to fraction form
    193.42/289.93 = 90.77/x
  3. Step 3: Cross multiply
    193.42x = 289.93 × 90.77
  4. Step 4: Simplify right side
    193.42x = 26,316.95
  5. Step 5: Solve for x
    x = 26,316.95/193.42
  6. Step 6: Final answer
    x = 136.06

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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.