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Finding the Fourth Proportional to 263.28, 392.57 and 260.09

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Solution

The fourth proportional to 263.28, 392.57 and 260.09 is: 387.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.28 : 392.57 = 260.09 : x
  2. Step 2: Convert to fraction form
    263.28/392.57 = 260.09/x
  3. Step 3: Cross multiply
    263.28x = 392.57 × 260.09
  4. Step 4: Simplify right side
    263.28x = 102,100.27
  5. Step 5: Solve for x
    x = 102,100.27/263.28
  6. Step 6: Final answer
    x = 387.80

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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.