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Finding the Fourth Proportional to 283.85, 390.74 and 221.57

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Solution

The fourth proportional to 283.85, 390.74 and 221.57 is: 305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.85 : 390.74 = 221.57 : x
  2. Step 2: Convert to fraction form
    283.85/390.74 = 221.57/x
  3. Step 3: Cross multiply
    283.85x = 390.74 × 221.57
  4. Step 4: Simplify right side
    283.85x = 86,576.26
  5. Step 5: Solve for x
    x = 86,576.26/283.85
  6. Step 6: Final answer
    x = 305.01

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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.