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Finding the Fourth Proportional to 403.78, 602.92 and 392.84

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Solution

The fourth proportional to 403.78, 602.92 and 392.84 is: 586.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.78 : 602.92 = 392.84 : x
  2. Step 2: Convert to fraction form
    403.78/602.92 = 392.84/x
  3. Step 3: Cross multiply
    403.78x = 602.92 × 392.84
  4. Step 4: Simplify right side
    403.78x = 236,849.13
  5. Step 5: Solve for x
    x = 236,849.13/403.78
  6. Step 6: Final answer
    x = 586.59

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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.