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Finding the Fourth Proportional to 283.58, 425.43 and 139.28

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Solution

The fourth proportional to 283.58, 425.43 and 139.28 is: 208.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.58 : 425.43 = 139.28 : x
  2. Step 2: Convert to fraction form
    283.58/425.43 = 139.28/x
  3. Step 3: Cross multiply
    283.58x = 425.43 × 139.28
  4. Step 4: Simplify right side
    283.58x = 59,253.89
  5. Step 5: Solve for x
    x = 59,253.89/283.58
  6. Step 6: Final answer
    x = 208.95

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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.