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Finding the Fourth Proportional to 715.13, 1,072.85 and 386.06

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Solution

The fourth proportional to 715.13, 1,072.85 and 386.06 is: 579.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.13 : 1,072.85 = 386.06 : x
  2. Step 2: Convert to fraction form
    715.13/1,072.85 = 386.06/x
  3. Step 3: Cross multiply
    715.13x = 1,072.85 × 386.06
  4. Step 4: Simplify right side
    715.13x = 414,185.57
  5. Step 5: Solve for x
    x = 414,185.57/715.13
  6. Step 6: Final answer
    x = 579.18

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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.