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Finding the Fourth Proportional to 392.22, 585.18 and 355.77

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Solution

The fourth proportional to 392.22, 585.18 and 355.77 is: 530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.22 : 585.18 = 355.77 : x
  2. Step 2: Convert to fraction form
    392.22/585.18 = 355.77/x
  3. Step 3: Cross multiply
    392.22x = 585.18 × 355.77
  4. Step 4: Simplify right side
    392.22x = 208,189.49
  5. Step 5: Solve for x
    x = 208,189.49/392.22
  6. Step 6: Final answer
    x = 530.80

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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.