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Finding the Fourth Proportional to 640.81, 955.13 and 605.53

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Solution

The fourth proportional to 640.81, 955.13 and 605.53 is: 902.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.81 : 955.13 = 605.53 : x
  2. Step 2: Convert to fraction form
    640.81/955.13 = 605.53/x
  3. Step 3: Cross multiply
    640.81x = 955.13 × 605.53
  4. Step 4: Simplify right side
    640.81x = 578,359.87
  5. Step 5: Solve for x
    x = 578,359.87/640.81
  6. Step 6: Final answer
    x = 902.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.