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Finding the Fourth Proportional to 622.91, 859.16 and 498.38

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Solution

The fourth proportional to 622.91, 859.16 and 498.38 is: 687.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.91 : 859.16 = 498.38 : x
  2. Step 2: Convert to fraction form
    622.91/859.16 = 498.38/x
  3. Step 3: Cross multiply
    622.91x = 859.16 × 498.38
  4. Step 4: Simplify right side
    622.91x = 428,185.11
  5. Step 5: Solve for x
    x = 428,185.11/622.91
  6. Step 6: Final answer
    x = 687.39

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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.