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Finding the Fourth Proportional to 705.43, 1,057.47 and 380.62

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Solution

The fourth proportional to 705.43, 1,057.47 and 380.62 is: 570.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.43 : 1,057.47 = 380.62 : x
  2. Step 2: Convert to fraction form
    705.43/1,057.47 = 380.62/x
  3. Step 3: Cross multiply
    705.43x = 1,057.47 × 380.62
  4. Step 4: Simplify right side
    705.43x = 402,494.23
  5. Step 5: Solve for x
    x = 402,494.23/705.43
  6. Step 6: Final answer
    x = 570.57

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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.