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Finding the Fourth Proportional to 1,298.49, 1,791.92 and 709.08

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Solution

The fourth proportional to 1,298.49, 1,791.92 and 709.08 is: 978.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.49 : 1,791.92 = 709.08 : x
  2. Step 2: Convert to fraction form
    1,298.49/1,791.92 = 709.08/x
  3. Step 3: Cross multiply
    1,298.49x = 1,791.92 × 709.08
  4. Step 4: Simplify right side
    1,298.49x = 1,270,614.63
  5. Step 5: Solve for x
    x = 1,270,614.63/1,298.49
  6. Step 6: Final answer
    x = 978.53

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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.