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Finding the Fourth Proportional to 715.19, 1,072.78 and 386.28

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Solution

The fourth proportional to 715.19, 1,072.78 and 386.28 is: 579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.19 : 1,072.78 = 386.28 : x
  2. Step 2: Convert to fraction form
    715.19/1,072.78 = 386.28/x
  3. Step 3: Cross multiply
    715.19x = 1,072.78 × 386.28
  4. Step 4: Simplify right side
    715.19x = 414,393.46
  5. Step 5: Solve for x
    x = 414,393.46/715.19
  6. Step 6: Final answer
    x = 579.42

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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.