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Finding the Fourth Proportional to 262.07, 391.05 and 260.55

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Solution

The fourth proportional to 262.07, 391.05 and 260.55 is: 388.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.07 : 391.05 = 260.55 : x
  2. Step 2: Convert to fraction form
    262.07/391.05 = 260.55/x
  3. Step 3: Cross multiply
    262.07x = 391.05 × 260.55
  4. Step 4: Simplify right side
    262.07x = 101,888.08
  5. Step 5: Solve for x
    x = 101,888.08/262.07
  6. Step 6: Final answer
    x = 388.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.