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Finding the Fourth Proportional to 392.77, 541.65 and 261.55

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Solution

The fourth proportional to 392.77, 541.65 and 261.55 is: 360.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.77 : 541.65 = 261.55 : x
  2. Step 2: Convert to fraction form
    392.77/541.65 = 261.55/x
  3. Step 3: Cross multiply
    392.77x = 541.65 × 261.55
  4. Step 4: Simplify right side
    392.77x = 141,668.56
  5. Step 5: Solve for x
    x = 141,668.56/392.77
  6. Step 6: Final answer
    x = 360.69

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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.