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Finding the Fourth Proportional to 494.83, 682.95 and 390.27

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Solution

The fourth proportional to 494.83, 682.95 and 390.27 is: 538.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.83 : 682.95 = 390.27 : x
  2. Step 2: Convert to fraction form
    494.83/682.95 = 390.27/x
  3. Step 3: Cross multiply
    494.83x = 682.95 × 390.27
  4. Step 4: Simplify right side
    494.83x = 266,534.90
  5. Step 5: Solve for x
    x = 266,534.90/494.83
  6. Step 6: Final answer
    x = 538.64

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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.