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Finding the Fourth Proportional to 1,007.15, 1,389.05 and 709.39

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Solution

The fourth proportional to 1,007.15, 1,389.05 and 709.39 is: 978.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.15 : 1,389.05 = 709.39 : x
  2. Step 2: Convert to fraction form
    1,007.15/1,389.05 = 709.39/x
  3. Step 3: Cross multiply
    1,007.15x = 1,389.05 × 709.39
  4. Step 4: Simplify right side
    1,007.15x = 985,367.69
  5. Step 5: Solve for x
    x = 985,367.69/1,007.15
  6. Step 6: Final answer
    x = 978.37

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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.