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Finding the Fourth Proportional to 1,397.69, 2,097.11 and 617.28

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Solution

The fourth proportional to 1,397.69, 2,097.11 and 617.28 is: 926.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.69 : 2,097.11 = 617.28 : x
  2. Step 2: Convert to fraction form
    1,397.69/2,097.11 = 617.28/x
  3. Step 3: Cross multiply
    1,397.69x = 2,097.11 × 617.28
  4. Step 4: Simplify right side
    1,397.69x = 1,294,504.06
  5. Step 5: Solve for x
    x = 1,294,504.06/1,397.69
  6. Step 6: Final answer
    x = 926.17

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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.