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Finding the Fourth Proportional to 985.26, 1,360.19 and 717.70

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Solution

The fourth proportional to 985.26, 1,360.19 and 717.70 is: 990.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.26 : 1,360.19 = 717.70 : x
  2. Step 2: Convert to fraction form
    985.26/1,360.19 = 717.70/x
  3. Step 3: Cross multiply
    985.26x = 1,360.19 × 717.70
  4. Step 4: Simplify right side
    985.26x = 976,208.36
  5. Step 5: Solve for x
    x = 976,208.36/985.26
  6. Step 6: Final answer
    x = 990.81

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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.