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Finding the Fourth Proportional to 715.79, 1,073.66 and 386.22

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Solution

The fourth proportional to 715.79, 1,073.66 and 386.22 is: 579.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.79 : 1,073.66 = 386.22 : x
  2. Step 2: Convert to fraction form
    715.79/1,073.66 = 386.22/x
  3. Step 3: Cross multiply
    715.79x = 1,073.66 × 386.22
  4. Step 4: Simplify right side
    715.79x = 414,665.02
  5. Step 5: Solve for x
    x = 414,665.02/715.79
  6. Step 6: Final answer
    x = 579.31

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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.