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Finding the Fourth Proportional to 622.16, 858.38 and 445.16

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Solution

The fourth proportional to 622.16, 858.38 and 445.16 is: 614.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.16 : 858.38 = 445.16 : x
  2. Step 2: Convert to fraction form
    622.16/858.38 = 445.16/x
  3. Step 3: Cross multiply
    622.16x = 858.38 × 445.16
  4. Step 4: Simplify right side
    622.16x = 382,116.44
  5. Step 5: Solve for x
    x = 382,116.44/622.16
  6. Step 6: Final answer
    x = 614.18

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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.