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Finding the Fourth Proportional to 497.23, 686.48 and 311.00

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Solution

The fourth proportional to 497.23, 686.48 and 311.00 is: 429.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.23 : 686.48 = 311.00 : x
  2. Step 2: Convert to fraction form
    497.23/686.48 = 311.00/x
  3. Step 3: Cross multiply
    497.23x = 686.48 × 311.00
  4. Step 4: Simplify right side
    497.23x = 213,490.29
  5. Step 5: Solve for x
    x = 213,490.29/497.23
  6. Step 6: Final answer
    x = 429.36

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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.