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Finding the Fourth Proportional to 739.89, 1,018.11 and 718.50

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Solution

The fourth proportional to 739.89, 1,018.11 and 718.50 is: 988.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.89 : 1,018.11 = 718.50 : x
  2. Step 2: Convert to fraction form
    739.89/1,018.11 = 718.50/x
  3. Step 3: Cross multiply
    739.89x = 1,018.11 × 718.50
  4. Step 4: Simplify right side
    739.89x = 731,512.04
  5. Step 5: Solve for x
    x = 731,512.04/739.89
  6. Step 6: Final answer
    x = 988.68

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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.