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Finding the Fourth Proportional to 1,009.30, 1,391.38 and 709.64

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Solution

The fourth proportional to 1,009.30, 1,391.38 and 709.64 is: 978.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.30 : 1,391.38 = 709.64 : x
  2. Step 2: Convert to fraction form
    1,009.30/1,391.38 = 709.64/x
  3. Step 3: Cross multiply
    1,009.30x = 1,391.38 × 709.64
  4. Step 4: Simplify right side
    1,009.30x = 987,378.90
  5. Step 5: Solve for x
    x = 987,378.90/1,009.30
  6. Step 6: Final answer
    x = 978.28

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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.