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Finding the Fourth Proportional to 963.72, 1,328.57 and 683.86

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Solution

The fourth proportional to 963.72, 1,328.57 and 683.86 is: 942.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.72 : 1,328.57 = 683.86 : x
  2. Step 2: Convert to fraction form
    963.72/1,328.57 = 683.86/x
  3. Step 3: Cross multiply
    963.72x = 1,328.57 × 683.86
  4. Step 4: Simplify right side
    963.72x = 908,552.20
  5. Step 5: Solve for x
    x = 908,552.20/963.72
  6. Step 6: Final answer
    x = 942.75

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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.