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Finding the Fourth Proportional to 708.79, 1,063.18 and 386.21

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Solution

The fourth proportional to 708.79, 1,063.18 and 386.21 is: 579.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.79 : 1,063.18 = 386.21 : x
  2. Step 2: Convert to fraction form
    708.79/1,063.18 = 386.21/x
  3. Step 3: Cross multiply
    708.79x = 1,063.18 × 386.21
  4. Step 4: Simplify right side
    708.79x = 410,610.75
  5. Step 5: Solve for x
    x = 410,610.75/708.79
  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.