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Finding the Fourth Proportional to 498.21, 685.07 and 442.85

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Solution

The fourth proportional to 498.21, 685.07 and 442.85 is: 608.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.21 : 685.07 = 442.85 : x
  2. Step 2: Convert to fraction form
    498.21/685.07 = 442.85/x
  3. Step 3: Cross multiply
    498.21x = 685.07 × 442.85
  4. Step 4: Simplify right side
    498.21x = 303,384.36
  5. Step 5: Solve for x
    x = 303,384.36/498.21
  6. Step 6: Final answer
    x = 608.95

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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.