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Finding the Fourth Proportional to 622.80, 859.66 and 401.76

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Solution

The fourth proportional to 622.80, 859.66 and 401.76 is: 554.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.80 : 859.66 = 401.76 : x
  2. Step 2: Convert to fraction form
    622.80/859.66 = 401.76/x
  3. Step 3: Cross multiply
    622.80x = 859.66 × 401.76
  4. Step 4: Simplify right side
    622.80x = 345,377.00
  5. Step 5: Solve for x
    x = 345,377.00/622.80
  6. Step 6: Final answer
    x = 554.56

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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.