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Finding the Fourth Proportional to 963, 1,329.44 and 905.40

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Solution

The fourth proportional to 963, 1,329.44 and 905.40 is: 1,249.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    963 : 1,329.44 = 905.40 : x
  2. Step 2: Convert to fraction form
    963/1,329.44 = 905.40/x
  3. Step 3: Cross multiply
    963x = 1,329.44 × 905.40
  4. Step 4: Simplify right side
    963x = 1,203,674.98
  5. Step 5: Solve for x
    x = 1,203,674.98/963
  6. Step 6: Final answer
    x = 1,249.92

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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.