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Finding the Fourth Proportional to 707.09, 1,059.85 and 398.86

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Solution

The fourth proportional to 707.09, 1,059.85 and 398.86 is: 597.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.09 : 1,059.85 = 398.86 : x
  2. Step 2: Convert to fraction form
    707.09/1,059.85 = 398.86/x
  3. Step 3: Cross multiply
    707.09x = 1,059.85 × 398.86
  4. Step 4: Simplify right side
    707.09x = 422,729.62
  5. Step 5: Solve for x
    x = 422,729.62/707.09
  6. Step 6: Final answer
    x = 597.85

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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.