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Finding the Fourth Proportional to 511.05, 705.19 and 289.99

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Solution

The fourth proportional to 511.05, 705.19 and 289.99 is: 400.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.05 : 705.19 = 289.99 : x
  2. Step 2: Convert to fraction form
    511.05/705.19 = 289.99/x
  3. Step 3: Cross multiply
    511.05x = 705.19 × 289.99
  4. Step 4: Simplify right side
    511.05x = 204,498.05
  5. Step 5: Solve for x
    x = 204,498.05/511.05
  6. Step 6: Final answer
    x = 400.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.