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Finding the Fourth Proportional to 622.65, 859.29 and 402.12

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Solution

The fourth proportional to 622.65, 859.29 and 402.12 is: 554.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.65 : 859.29 = 402.12 : x
  2. Step 2: Convert to fraction form
    622.65/859.29 = 402.12/x
  3. Step 3: Cross multiply
    622.65x = 859.29 × 402.12
  4. Step 4: Simplify right side
    622.65x = 345,537.69
  5. Step 5: Solve for x
    x = 345,537.69/622.65
  6. Step 6: Final answer
    x = 554.95

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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.