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Finding the Fourth Proportional to 715.23, 1,072.82 and 386.32

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Solution

The fourth proportional to 715.23, 1,072.82 and 386.32 is: 579.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.23 : 1,072.82 = 386.32 : x
  2. Step 2: Convert to fraction form
    715.23/1,072.82 = 386.32/x
  3. Step 3: Cross multiply
    715.23x = 1,072.82 × 386.32
  4. Step 4: Simplify right side
    715.23x = 414,451.82
  5. Step 5: Solve for x
    x = 414,451.82/715.23
  6. Step 6: Final answer
    x = 579.47

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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.