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Finding the Fourth Proportional to 913.26, 1,369.83 and 811.70

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Solution

The fourth proportional to 913.26, 1,369.83 and 811.70 is: 1,217.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.26 : 1,369.83 = 811.70 : x
  2. Step 2: Convert to fraction form
    913.26/1,369.83 = 811.70/x
  3. Step 3: Cross multiply
    913.26x = 1,369.83 × 811.70
  4. Step 4: Simplify right side
    913.26x = 1,111,891.01
  5. Step 5: Solve for x
    x = 1,111,891.01/913.26
  6. Step 6: Final answer
    x = 1,217.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.