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Finding the Fourth Proportional to 636.66, 879.46 and 498.53

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Solution

The fourth proportional to 636.66, 879.46 and 498.53 is: 688.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.66 : 879.46 = 498.53 : x
  2. Step 2: Convert to fraction form
    636.66/879.46 = 498.53/x
  3. Step 3: Cross multiply
    636.66x = 879.46 × 498.53
  4. Step 4: Simplify right side
    636.66x = 438,438.15
  5. Step 5: Solve for x
    x = 438,438.15/636.66
  6. Step 6: Final answer
    x = 688.65

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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.