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Finding the Fourth Proportional to 497.28, 686.57 and 300.90

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Solution

The fourth proportional to 497.28, 686.57 and 300.90 is: 415.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.28 : 686.57 = 300.90 : x
  2. Step 2: Convert to fraction form
    497.28/686.57 = 300.90/x
  3. Step 3: Cross multiply
    497.28x = 686.57 × 300.90
  4. Step 4: Simplify right side
    497.28x = 206,590.50
  5. Step 5: Solve for x
    x = 206,590.50/497.28
  6. Step 6: Final answer
    x = 415.44

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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.