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Finding the Fourth Proportional to 262.57, 393.87 and 86.89

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Solution

The fourth proportional to 262.57, 393.87 and 86.89 is: 130.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.57 : 393.87 = 86.89 : x
  2. Step 2: Convert to fraction form
    262.57/393.87 = 86.89/x
  3. Step 3: Cross multiply
    262.57x = 393.87 × 86.89
  4. Step 4: Simplify right side
    262.57x = 34,223.36
  5. Step 5: Solve for x
    x = 34,223.36/262.57
  6. Step 6: Final answer
    x = 130.34

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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.