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Finding the Fourth Proportional to 969.51, 1,446.79 and 813.99

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Solution

The fourth proportional to 969.51, 1,446.79 and 813.99 is: 1,214.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.51 : 1,446.79 = 813.99 : x
  2. Step 2: Convert to fraction form
    969.51/1,446.79 = 813.99/x
  3. Step 3: Cross multiply
    969.51x = 1,446.79 × 813.99
  4. Step 4: Simplify right side
    969.51x = 1,177,670.56
  5. Step 5: Solve for x
    x = 1,177,670.56/969.51
  6. Step 6: Final answer
    x = 1,214.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.