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Finding the Fourth Proportional to 262.51, 393.48 and 91.39

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Solution

The fourth proportional to 262.51, 393.48 and 91.39 is: 136.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.51 : 393.48 = 91.39 : x
  2. Step 2: Convert to fraction form
    262.51/393.48 = 91.39/x
  3. Step 3: Cross multiply
    262.51x = 393.48 × 91.39
  4. Step 4: Simplify right side
    262.51x = 35,960.14
  5. Step 5: Solve for x
    x = 35,960.14/262.51
  6. Step 6: Final answer
    x = 136.99

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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.