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Finding the Fourth Proportional to 705.79, 1,057.74 and 397.72

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Solution

The fourth proportional to 705.79, 1,057.74 and 397.72 is: 596.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.79 : 1,057.74 = 397.72 : x
  2. Step 2: Convert to fraction form
    705.79/1,057.74 = 397.72/x
  3. Step 3: Cross multiply
    705.79x = 1,057.74 × 397.72
  4. Step 4: Simplify right side
    705.79x = 420,684.35
  5. Step 5: Solve for x
    x = 420,684.35/705.79
  6. Step 6: Final answer
    x = 596.05

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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.