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Finding the Fourth Proportional to 781.21, 1,078.52 and 750.23

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Solution

The fourth proportional to 781.21, 1,078.52 and 750.23 is: 1,035.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.21 : 1,078.52 = 750.23 : x
  2. Step 2: Convert to fraction form
    781.21/1,078.52 = 750.23/x
  3. Step 3: Cross multiply
    781.21x = 1,078.52 × 750.23
  4. Step 4: Simplify right side
    781.21x = 809,128.92
  5. Step 5: Solve for x
    x = 809,128.92/781.21
  6. Step 6: Final answer
    x = 1,035.74

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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.