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Finding the Fourth Proportional to 511.20, 705.45 and 278.33

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Solution

The fourth proportional to 511.20, 705.45 and 278.33 is: 384.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.20 : 705.45 = 278.33 : x
  2. Step 2: Convert to fraction form
    511.20/705.45 = 278.33/x
  3. Step 3: Cross multiply
    511.20x = 705.45 × 278.33
  4. Step 4: Simplify right side
    511.20x = 196,347.90
  5. Step 5: Solve for x
    x = 196,347.90/511.20
  6. Step 6: Final answer
    x = 384.09

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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.