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Finding the Fourth Proportional to 715.15, 1,072.72 and 221.56

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Solution

The fourth proportional to 715.15, 1,072.72 and 221.56 is: 332.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.15 : 1,072.72 = 221.56 : x
  2. Step 2: Convert to fraction form
    715.15/1,072.72 = 221.56/x
  3. Step 3: Cross multiply
    715.15x = 1,072.72 × 221.56
  4. Step 4: Simplify right side
    715.15x = 237,671.84
  5. Step 5: Solve for x
    x = 237,671.84/715.15
  6. Step 6: Final answer
    x = 332.34

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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.