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Finding the Fourth Proportional to 360.64, 540.96 and 198.40

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Solution

The fourth proportional to 360.64, 540.96 and 198.40 is: 297.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.64 : 540.96 = 198.40 : x
  2. Step 2: Convert to fraction form
    360.64/540.96 = 198.40/x
  3. Step 3: Cross multiply
    360.64x = 540.96 × 198.40
  4. Step 4: Simplify right side
    360.64x = 107,326.46
  5. Step 5: Solve for x
    x = 107,326.46/360.64
  6. Step 6: Final answer
    x = 297.60

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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.