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Finding the Fourth Proportional to 1,012.97, 1,394.66 and 865.01

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Solution

The fourth proportional to 1,012.97, 1,394.66 and 865.01 is: 1,190.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.97 : 1,394.66 = 865.01 : x
  2. Step 2: Convert to fraction form
    1,012.97/1,394.66 = 865.01/x
  3. Step 3: Cross multiply
    1,012.97x = 1,394.66 × 865.01
  4. Step 4: Simplify right side
    1,012.97x = 1,206,400.50
  5. Step 5: Solve for x
    x = 1,206,400.50/1,012.97
  6. Step 6: Final answer
    x = 1,190.95

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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.