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Finding the Fourth Proportional to 640.96, 888.56 and 605.89

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Solution

The fourth proportional to 640.96, 888.56 and 605.89 is: 839.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.96 : 888.56 = 605.89 : x
  2. Step 2: Convert to fraction form
    640.96/888.56 = 605.89/x
  3. Step 3: Cross multiply
    640.96x = 888.56 × 605.89
  4. Step 4: Simplify right side
    640.96x = 538,368.38
  5. Step 5: Solve for x
    x = 538,368.38/640.96
  6. Step 6: Final answer
    x = 839.94

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1.5x scale

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.