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Finding the Fourth Proportional to 497.48, 685.68 and 392.30

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Solution

The fourth proportional to 497.48, 685.68 and 392.30 is: 540.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.48 : 685.68 = 392.30 : x
  2. Step 2: Convert to fraction form
    497.48/685.68 = 392.30/x
  3. Step 3: Cross multiply
    497.48x = 685.68 × 392.30
  4. Step 4: Simplify right side
    497.48x = 268,992.26
  5. Step 5: Solve for x
    x = 268,992.26/497.48
  6. Step 6: Final answer
    x = 540.71

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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.