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Finding the Fourth Proportional to 284.72, 427.01 and 138.42

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Solution

The fourth proportional to 284.72, 427.01 and 138.42 is: 207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.72 : 427.01 = 138.42 : x
  2. Step 2: Convert to fraction form
    284.72/427.01 = 138.42/x
  3. Step 3: Cross multiply
    284.72x = 427.01 × 138.42
  4. Step 4: Simplify right side
    284.72x = 59,106.03
  5. Step 5: Solve for x
    x = 59,106.03/284.72
  6. Step 6: Final answer
    x = 207.60

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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.