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Finding the Fourth Proportional to 264.72, 396.72 and 142.80

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Solution

The fourth proportional to 264.72, 396.72 and 142.80 is: 214.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.72 : 396.72 = 142.80 : x
  2. Step 2: Convert to fraction form
    264.72/396.72 = 142.80/x
  3. Step 3: Cross multiply
    264.72x = 396.72 × 142.80
  4. Step 4: Simplify right side
    264.72x = 56,651.62
  5. Step 5: Solve for x
    x = 56,651.62/264.72
  6. Step 6: Final answer
    x = 214.01

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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.