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Finding the Fourth Proportional to 622.75, 859.43 and 357.22

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Solution

The fourth proportional to 622.75, 859.43 and 357.22 is: 492.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.75 : 859.43 = 357.22 : x
  2. Step 2: Convert to fraction form
    622.75/859.43 = 357.22/x
  3. Step 3: Cross multiply
    622.75x = 859.43 × 357.22
  4. Step 4: Simplify right side
    622.75x = 307,005.58
  5. Step 5: Solve for x
    x = 307,005.58/622.75
  6. Step 6: Final answer
    x = 492.98

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Double scale
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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.