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Finding the Fourth Proportional to 645.48, 961.65 and 605.70

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Solution

The fourth proportional to 645.48, 961.65 and 605.70 is: 902.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.48 : 961.65 = 605.70 : x
  2. Step 2: Convert to fraction form
    645.48/961.65 = 605.70/x
  3. Step 3: Cross multiply
    645.48x = 961.65 × 605.70
  4. Step 4: Simplify right side
    645.48x = 582,471.41
  5. Step 5: Solve for x
    x = 582,471.41/645.48
  6. Step 6: Final answer
    x = 902.38

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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.