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Finding the Fourth Proportional to 622.84, 859.22 and 401.72

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Solution

The fourth proportional to 622.84, 859.22 and 401.72 is: 554.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.84 : 859.22 = 401.72 : x
  2. Step 2: Convert to fraction form
    622.84/859.22 = 401.72/x
  3. Step 3: Cross multiply
    622.84x = 859.22 × 401.72
  4. Step 4: Simplify right side
    622.84x = 345,165.86
  5. Step 5: Solve for x
    x = 345,165.86/622.84
  6. Step 6: Final answer
    x = 554.18

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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.