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Finding the Fourth Proportional to 392.58, 538.77 and 355.66

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Solution

The fourth proportional to 392.58, 538.77 and 355.66 is: 488.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.58 : 538.77 = 355.66 : x
  2. Step 2: Convert to fraction form
    392.58/538.77 = 355.66/x
  3. Step 3: Cross multiply
    392.58x = 538.77 × 355.66
  4. Step 4: Simplify right side
    392.58x = 191,618.94
  5. Step 5: Solve for x
    x = 191,618.94/392.58
  6. Step 6: Final answer
    x = 488.10

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.