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Finding the Fourth Proportional to 497.58, 686.80 and 311.04

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Solution

The fourth proportional to 497.58, 686.80 and 311.04 is: 429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.58 : 686.80 = 311.04 : x
  2. Step 2: Convert to fraction form
    497.58/686.80 = 311.04/x
  3. Step 3: Cross multiply
    497.58x = 686.80 × 311.04
  4. Step 4: Simplify right side
    497.58x = 213,622.27
  5. Step 5: Solve for x
    x = 213,622.27/497.58
  6. Step 6: Final answer
    x = 429.32

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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.