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Finding the Fourth Proportional to 498.89, 686.99 and 457.31

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Solution

The fourth proportional to 498.89, 686.99 and 457.31 is: 629.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.89 : 686.99 = 457.31 : x
  2. Step 2: Convert to fraction form
    498.89/686.99 = 457.31/x
  3. Step 3: Cross multiply
    498.89x = 686.99 × 457.31
  4. Step 4: Simplify right side
    498.89x = 314,170.26
  5. Step 5: Solve for x
    x = 314,170.26/498.89
  6. Step 6: Final answer
    x = 629.74

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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.