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Finding the Fourth Proportional to 1,007.82, 1,390.29 and 713.38

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Solution

The fourth proportional to 1,007.82, 1,390.29 and 713.38 is: 984.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.82 : 1,390.29 = 713.38 : x
  2. Step 2: Convert to fraction form
    1,007.82/1,390.29 = 713.38/x
  3. Step 3: Cross multiply
    1,007.82x = 1,390.29 × 713.38
  4. Step 4: Simplify right side
    1,007.82x = 991,805.08
  5. Step 5: Solve for x
    x = 991,805.08/1,007.82
  6. Step 6: Final answer
    x = 984.11

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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.