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Finding the Fourth Proportional to 283.44, 424.96 and 139.28

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Solution

The fourth proportional to 283.44, 424.96 and 139.28 is: 208.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.44 : 424.96 = 139.28 : x
  2. Step 2: Convert to fraction form
    283.44/424.96 = 139.28/x
  3. Step 3: Cross multiply
    283.44x = 424.96 × 139.28
  4. Step 4: Simplify right side
    283.44x = 59,188.43
  5. Step 5: Solve for x
    x = 59,188.43/283.44
  6. Step 6: Final answer
    x = 208.82

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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.