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Finding the Fourth Proportional to 931.26, 1,396.35 and 720.11

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Solution

The fourth proportional to 931.26, 1,396.35 and 720.11 is: 1,079.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.26 : 1,396.35 = 720.11 : x
  2. Step 2: Convert to fraction form
    931.26/1,396.35 = 720.11/x
  3. Step 3: Cross multiply
    931.26x = 1,396.35 × 720.11
  4. Step 4: Simplify right side
    931.26x = 1,005,519.21
  5. Step 5: Solve for x
    x = 1,005,519.21/931.26
  6. Step 6: Final answer
    x = 1,079.75

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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.