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Finding the Fourth Proportional to 360.80, 540.28 and 206.45

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Solution

The fourth proportional to 360.80, 540.28 and 206.45 is: 309.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.80 : 540.28 = 206.45 : x
  2. Step 2: Convert to fraction form
    360.80/540.28 = 206.45/x
  3. Step 3: Cross multiply
    360.80x = 540.28 × 206.45
  4. Step 4: Simplify right side
    360.80x = 111,539.77
  5. Step 5: Solve for x
    x = 111,539.77/360.80
  6. Step 6: Final answer
    x = 309.15

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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.