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Finding the Fourth Proportional to 284.72, 427.28 and 140.48

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Solution

The fourth proportional to 284.72, 427.28 and 140.48 is: 210.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.72 : 427.28 = 140.48 : x
  2. Step 2: Convert to fraction form
    284.72/427.28 = 140.48/x
  3. Step 3: Cross multiply
    284.72x = 427.28 × 140.48
  4. Step 4: Simplify right side
    284.72x = 60,024.29
  5. Step 5: Solve for x
    x = 60,024.29/284.72
  6. Step 6: Final answer
    x = 210.82

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.