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Finding the Fourth Proportional to 486.42, 729.88 and 270.12

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Solution

The fourth proportional to 486.42, 729.88 and 270.12 is: 405.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.42 : 729.88 = 270.12 : x
  2. Step 2: Convert to fraction form
    486.42/729.88 = 270.12/x
  3. Step 3: Cross multiply
    486.42x = 729.88 × 270.12
  4. Step 4: Simplify right side
    486.42x = 197,155.19
  5. Step 5: Solve for x
    x = 197,155.19/486.42
  6. Step 6: Final answer
    x = 405.32

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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.