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Finding the Fourth Proportional to 499.86, 688.32 and 489.06

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Solution

The fourth proportional to 499.86, 688.32 and 489.06 is: 673.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.86 : 688.32 = 489.06 : x
  2. Step 2: Convert to fraction form
    499.86/688.32 = 489.06/x
  3. Step 3: Cross multiply
    499.86x = 688.32 × 489.06
  4. Step 4: Simplify right side
    499.86x = 336,629.78
  5. Step 5: Solve for x
    x = 336,629.78/499.86
  6. Step 6: Final answer
    x = 673.45

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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.