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Finding the Fourth Proportional to 499.84, 688.39 and 489.07

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Solution

The fourth proportional to 499.84, 688.39 and 489.07 is: 673.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.84 : 688.39 = 489.07 : x
  2. Step 2: Convert to fraction form
    499.84/688.39 = 489.07/x
  3. Step 3: Cross multiply
    499.84x = 688.39 × 489.07
  4. Step 4: Simplify right side
    499.84x = 336,670.90
  5. Step 5: Solve for x
    x = 336,670.90/499.84
  6. Step 6: Final answer
    x = 673.56

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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.