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Finding the Fourth Proportional to 283.79, 425.82 and 139.50

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Solution

The fourth proportional to 283.79, 425.82 and 139.50 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.79 : 425.82 = 139.50 : x
  2. Step 2: Convert to fraction form
    283.79/425.82 = 139.50/x
  3. Step 3: Cross multiply
    283.79x = 425.82 × 139.50
  4. Step 4: Simplify right side
    283.79x = 59,401.89
  5. Step 5: Solve for x
    x = 59,401.89/283.79
  6. Step 6: Final answer
    x = 209.32

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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.