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Finding the Fourth Proportional to 497.37, 686.49 and 287.66

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Solution

The fourth proportional to 497.37, 686.49 and 287.66 is: 397.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.37 : 686.49 = 287.66 : x
  2. Step 2: Convert to fraction form
    497.37/686.49 = 287.66/x
  3. Step 3: Cross multiply
    497.37x = 686.49 × 287.66
  4. Step 4: Simplify right side
    497.37x = 197,475.71
  5. Step 5: Solve for x
    x = 197,475.71/497.37
  6. Step 6: Final answer
    x = 397.04

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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.