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Finding the Fourth Proportional to 378.64, 567.20 and 281.44

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Solution

The fourth proportional to 378.64, 567.20 and 281.44 is: 421.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.64 : 567.20 = 281.44 : x
  2. Step 2: Convert to fraction form
    378.64/567.20 = 281.44/x
  3. Step 3: Cross multiply
    378.64x = 567.20 × 281.44
  4. Step 4: Simplify right side
    378.64x = 159,632.77
  5. Step 5: Solve for x
    x = 159,632.77/378.64
  6. Step 6: Final answer
    x = 421.60

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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.