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Finding the Fourth Proportional to 736.12, 1,016.94 and 643.24

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Solution

The fourth proportional to 736.12, 1,016.94 and 643.24 is: 888.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.12 : 1,016.94 = 643.24 : x
  2. Step 2: Convert to fraction form
    736.12/1,016.94 = 643.24/x
  3. Step 3: Cross multiply
    736.12x = 1,016.94 × 643.24
  4. Step 4: Simplify right side
    736.12x = 654,136.49
  5. Step 5: Solve for x
    x = 654,136.49/736.12
  6. Step 6: Final answer
    x = 888.63

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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.