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Finding the Fourth Proportional to 499.70, 688.85 and 489.30

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Solution

The fourth proportional to 499.70, 688.85 and 489.30 is: 674.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.70 : 688.85 = 489.30 : x
  2. Step 2: Convert to fraction form
    499.70/688.85 = 489.30/x
  3. Step 3: Cross multiply
    499.70x = 688.85 × 489.30
  4. Step 4: Simplify right side
    499.70x = 337,054.31
  5. Step 5: Solve for x
    x = 337,054.31/499.70
  6. Step 6: Final answer
    x = 674.51

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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.