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Finding the Fourth Proportional to 497.02, 686.20 and 310.58

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Solution

The fourth proportional to 497.02, 686.20 and 310.58 is: 428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.02 : 686.20 = 310.58 : x
  2. Step 2: Convert to fraction form
    497.02/686.20 = 310.58/x
  3. Step 3: Cross multiply
    497.02x = 686.20 × 310.58
  4. Step 4: Simplify right side
    497.02x = 213,120.00
  5. Step 5: Solve for x
    x = 213,120.00/497.02
  6. Step 6: Final answer
    x = 428.80

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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.