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Finding the Fourth Proportional to 643.01, 886.55 and 608.38

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Solution

The fourth proportional to 643.01, 886.55 and 608.38 is: 838.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.01 : 886.55 = 608.38 : x
  2. Step 2: Convert to fraction form
    643.01/886.55 = 608.38/x
  3. Step 3: Cross multiply
    643.01x = 886.55 × 608.38
  4. Step 4: Simplify right side
    643.01x = 539,354.03
  5. Step 5: Solve for x
    x = 539,354.03/643.01
  6. Step 6: Final answer
    x = 838.80

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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.