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Finding the Fourth Proportional to 498.79, 688.43 and 299.64

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Solution

The fourth proportional to 498.79, 688.43 and 299.64 is: 413.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.79 : 688.43 = 299.64 : x
  2. Step 2: Convert to fraction form
    498.79/688.43 = 299.64/x
  3. Step 3: Cross multiply
    498.79x = 688.43 × 299.64
  4. Step 4: Simplify right side
    498.79x = 206,281.17
  5. Step 5: Solve for x
    x = 206,281.17/498.79
  6. Step 6: Final answer
    x = 413.56

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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.