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Finding the Fourth Proportional to 709.18, 1,063.83 and 215.59

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Solution

The fourth proportional to 709.18, 1,063.83 and 215.59 is: 323.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.18 : 1,063.83 = 215.59 : x
  2. Step 2: Convert to fraction form
    709.18/1,063.83 = 215.59/x
  3. Step 3: Cross multiply
    709.18x = 1,063.83 × 215.59
  4. Step 4: Simplify right side
    709.18x = 229,348.26
  5. Step 5: Solve for x
    x = 229,348.26/709.18
  6. Step 6: Final answer
    x = 323.40

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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.