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Finding the Fourth Proportional to 643.22, 891.69 and 608.14

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Solution

The fourth proportional to 643.22, 891.69 and 608.14 is: 843.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.22 : 891.69 = 608.14 : x
  2. Step 2: Convert to fraction form
    643.22/891.69 = 608.14/x
  3. Step 3: Cross multiply
    643.22x = 891.69 × 608.14
  4. Step 4: Simplify right side
    643.22x = 542,271.19
  5. Step 5: Solve for x
    x = 542,271.19/643.22
  6. Step 6: Final answer
    x = 843.06

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.