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Finding the Fourth Proportional to 715.21, 1,072.20 and 681.19

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Solution

The fourth proportional to 715.21, 1,072.20 and 681.19 is: 1,021.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.21 : 1,072.20 = 681.19 : x
  2. Step 2: Convert to fraction form
    715.21/1,072.20 = 681.19/x
  3. Step 3: Cross multiply
    715.21x = 1,072.20 × 681.19
  4. Step 4: Simplify right side
    715.21x = 730,364.85
  5. Step 5: Solve for x
    x = 730,364.85/715.21
  6. Step 6: Final answer
    x = 1,021.20

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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.