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Finding the Fourth Proportional to 719.98, 1,071.33 and 717.55

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Solution

The fourth proportional to 719.98, 1,071.33 and 717.55 is: 1,067.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.98 : 1,071.33 = 717.55 : x
  2. Step 2: Convert to fraction form
    719.98/1,071.33 = 717.55/x
  3. Step 3: Cross multiply
    719.98x = 1,071.33 × 717.55
  4. Step 4: Simplify right side
    719.98x = 768,731.05
  5. Step 5: Solve for x
    x = 768,731.05/719.98
  6. Step 6: Final answer
    x = 1,067.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.