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Finding the Fourth Proportional to 715, 1,072.22 and 455.18

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Solution

The fourth proportional to 715, 1,072.22 and 455.18 is: 682.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    715 : 1,072.22 = 455.18 : x
  2. Step 2: Convert to fraction form
    715/1,072.22 = 455.18/x
  3. Step 3: Cross multiply
    715x = 1,072.22 × 455.18
  4. Step 4: Simplify right side
    715x = 488,053.10
  5. Step 5: Solve for x
    x = 488,053.10/715
  6. Step 6: Final answer
    x = 682.59

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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.