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Finding the Fourth Proportional to 715.27, 1,071.26 and 690.65

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Solution

The fourth proportional to 715.27, 1,071.26 and 690.65 is: 1,034.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.27 : 1,071.26 = 690.65 : x
  2. Step 2: Convert to fraction form
    715.27/1,071.26 = 690.65/x
  3. Step 3: Cross multiply
    715.27x = 1,071.26 × 690.65
  4. Step 4: Simplify right side
    715.27x = 739,865.72
  5. Step 5: Solve for x
    x = 739,865.72/715.27
  6. Step 6: Final answer
    x = 1,034.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.