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Finding the Fourth Proportional to 705.67, 1,057.81 and 266.80

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Solution

The fourth proportional to 705.67, 1,057.81 and 266.80 is: 399.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.67 : 1,057.81 = 266.80 : x
  2. Step 2: Convert to fraction form
    705.67/1,057.81 = 266.80/x
  3. Step 3: Cross multiply
    705.67x = 1,057.81 × 266.80
  4. Step 4: Simplify right side
    705.67x = 282,223.71
  5. Step 5: Solve for x
    x = 282,223.71/705.67
  6. Step 6: Final answer
    x = 399.94

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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.