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Finding the Fourth Proportional to 913.30, 1,370.91 and 811.24

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Solution

The fourth proportional to 913.30, 1,370.91 and 811.24 is: 1,217.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.30 : 1,370.91 = 811.24 : x
  2. Step 2: Convert to fraction form
    913.30/1,370.91 = 811.24/x
  3. Step 3: Cross multiply
    913.30x = 1,370.91 × 811.24
  4. Step 4: Simplify right side
    913.30x = 1,112,137.03
  5. Step 5: Solve for x
    x = 1,112,137.03/913.30
  6. Step 6: Final answer
    x = 1,217.71

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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.