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Finding the Fourth Proportional to 755.09, 1,040.23 and 718.03

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Solution

The fourth proportional to 755.09, 1,040.23 and 718.03 is: 989.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.09 : 1,040.23 = 718.03 : x
  2. Step 2: Convert to fraction form
    755.09/1,040.23 = 718.03/x
  3. Step 3: Cross multiply
    755.09x = 1,040.23 × 718.03
  4. Step 4: Simplify right side
    755.09x = 746,916.35
  5. Step 5: Solve for x
    x = 746,916.35/755.09
  6. Step 6: Final answer
    x = 989.18

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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.