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Finding the Fourth Proportional to 963.45, 1,329.71 and 815.85

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Solution

The fourth proportional to 963.45, 1,329.71 and 815.85 is: 1,125.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.45 : 1,329.71 = 815.85 : x
  2. Step 2: Convert to fraction form
    963.45/1,329.71 = 815.85/x
  3. Step 3: Cross multiply
    963.45x = 1,329.71 × 815.85
  4. Step 4: Simplify right side
    963.45x = 1,084,839.82
  5. Step 5: Solve for x
    x = 1,084,839.82/963.45
  6. Step 6: Final answer
    x = 1,125.99

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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.