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Finding the Fourth Proportional to 705.55, 1,057.99 and 243.21

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Solution

The fourth proportional to 705.55, 1,057.99 and 243.21 is: 364.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.55 : 1,057.99 = 243.21 : x
  2. Step 2: Convert to fraction form
    705.55/1,057.99 = 243.21/x
  3. Step 3: Cross multiply
    705.55x = 1,057.99 × 243.21
  4. Step 4: Simplify right side
    705.55x = 257,313.75
  5. Step 5: Solve for x
    x = 257,313.75/705.55
  6. Step 6: Final answer
    x = 364.70

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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.