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Finding the Fourth Proportional to 963.48, 1,329.18 and 648.68

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Solution

The fourth proportional to 963.48, 1,329.18 and 648.68 is: 894.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.48 : 1,329.18 = 648.68 : x
  2. Step 2: Convert to fraction form
    963.48/1,329.18 = 648.68/x
  3. Step 3: Cross multiply
    963.48x = 1,329.18 × 648.68
  4. Step 4: Simplify right side
    963.48x = 862,212.48
  5. Step 5: Solve for x
    x = 862,212.48/963.48
  6. Step 6: Final answer
    x = 894.89

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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.