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Finding the Fourth Proportional to 497.78, 686.96 and 287.96

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Solution

The fourth proportional to 497.78, 686.96 and 287.96 is: 397.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.78 : 686.96 = 287.96 : x
  2. Step 2: Convert to fraction form
    497.78/686.96 = 287.96/x
  3. Step 3: Cross multiply
    497.78x = 686.96 × 287.96
  4. Step 4: Simplify right side
    497.78x = 197,817.00
  5. Step 5: Solve for x
    x = 197,817.00/497.78
  6. Step 6: Final answer
    x = 397.40

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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.