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Finding the Fourth Proportional to 715.26, 1,072.76 and 221.60

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Solution

The fourth proportional to 715.26, 1,072.76 and 221.60 is: 332.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.26 : 1,072.76 = 221.60 : x
  2. Step 2: Convert to fraction form
    715.26/1,072.76 = 221.60/x
  3. Step 3: Cross multiply
    715.26x = 1,072.76 × 221.60
  4. Step 4: Simplify right side
    715.26x = 237,717.14
  5. Step 5: Solve for x
    x = 237,717.14/715.26
  6. Step 6: Final answer
    x = 332.35

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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.