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Finding the Fourth Proportional to 283.06, 390.12 and 220.80

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Solution

The fourth proportional to 283.06, 390.12 and 220.80 is: 304.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.06 : 390.12 = 220.80 : x
  2. Step 2: Convert to fraction form
    283.06/390.12 = 220.80/x
  3. Step 3: Cross multiply
    283.06x = 390.12 × 220.80
  4. Step 4: Simplify right side
    283.06x = 86,138.50
  5. Step 5: Solve for x
    x = 86,138.50/283.06
  6. Step 6: Final answer
    x = 304.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.