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Finding the Fourth Proportional to 720.73, 1,072.44 and 718.30

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Solution

The fourth proportional to 720.73, 1,072.44 and 718.30 is: 1,068.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.73 : 1,072.44 = 718.30 : x
  2. Step 2: Convert to fraction form
    720.73/1,072.44 = 718.30/x
  3. Step 3: Cross multiply
    720.73x = 1,072.44 × 718.30
  4. Step 4: Simplify right side
    720.73x = 770,333.65
  5. Step 5: Solve for x
    x = 770,333.65/720.73
  6. Step 6: Final answer
    x = 1,068.82

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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.