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Finding the Fourth Proportional to 1,011.07, 1,394.71 and 617.41

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Solution

The fourth proportional to 1,011.07, 1,394.71 and 617.41 is: 851.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.07 : 1,394.71 = 617.41 : x
  2. Step 2: Convert to fraction form
    1,011.07/1,394.71 = 617.41/x
  3. Step 3: Cross multiply
    1,011.07x = 1,394.71 × 617.41
  4. Step 4: Simplify right side
    1,011.07x = 861,107.90
  5. Step 5: Solve for x
    x = 861,107.90/1,011.07
  6. Step 6: Final answer
    x = 851.68

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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.