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Finding the Fourth Proportional to 979.33, 1,351.23 and 716.89

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Solution

The fourth proportional to 979.33, 1,351.23 and 716.89 is: 989.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.33 : 1,351.23 = 716.89 : x
  2. Step 2: Convert to fraction form
    979.33/1,351.23 = 716.89/x
  3. Step 3: Cross multiply
    979.33x = 1,351.23 × 716.89
  4. Step 4: Simplify right side
    979.33x = 968,683.27
  5. Step 5: Solve for x
    x = 968,683.27/979.33
  6. Step 6: Final answer
    x = 989.13

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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.