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Finding the Fourth Proportional to 140.53, 193.93 and 90.81

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Solution

The fourth proportional to 140.53, 193.93 and 90.81 is: 125.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.53 : 193.93 = 90.81 : x
  2. Step 2: Convert to fraction form
    140.53/193.93 = 90.81/x
  3. Step 3: Cross multiply
    140.53x = 193.93 × 90.81
  4. Step 4: Simplify right side
    140.53x = 17,610.71
  5. Step 5: Solve for x
    x = 17,610.71/140.53
  6. Step 6: Final answer
    x = 125.31

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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.