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Finding the Fourth Proportional to 497.12, 686.08 and 287.36

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Solution

The fourth proportional to 497.12, 686.08 and 287.36 is: 396.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.12 : 686.08 = 287.36 : x
  2. Step 2: Convert to fraction form
    497.12/686.08 = 287.36/x
  3. Step 3: Cross multiply
    497.12x = 686.08 × 287.36
  4. Step 4: Simplify right side
    497.12x = 197,151.95
  5. Step 5: Solve for x
    x = 197,151.95/497.12
  6. Step 6: Final answer
    x = 396.59

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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.