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Finding the Fourth Proportional to 284.78, 427.21 and 102.13

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Solution

The fourth proportional to 284.78, 427.21 and 102.13 is: 153.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.78 : 427.21 = 102.13 : x
  2. Step 2: Convert to fraction form
    284.78/427.21 = 102.13/x
  3. Step 3: Cross multiply
    284.78x = 427.21 × 102.13
  4. Step 4: Simplify right side
    284.78x = 43,630.96
  5. Step 5: Solve for x
    x = 43,630.96/284.78
  6. Step 6: Final answer
    x = 153.21

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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.