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Finding the Fourth Proportional to 497.77, 687.17 and 311.36

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Solution

The fourth proportional to 497.77, 687.17 and 311.36 is: 429.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.77 : 687.17 = 311.36 : x
  2. Step 2: Convert to fraction form
    497.77/687.17 = 311.36/x
  3. Step 3: Cross multiply
    497.77x = 687.17 × 311.36
  4. Step 4: Simplify right side
    497.77x = 213,955.69
  5. Step 5: Solve for x
    x = 213,955.69/497.77
  6. Step 6: Final answer
    x = 429.83

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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.