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Finding the Fourth Proportional to 283.85, 390.91 and 255.61

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Solution

The fourth proportional to 283.85, 390.91 and 255.61 is: 352.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.85 : 390.91 = 255.61 : x
  2. Step 2: Convert to fraction form
    283.85/390.91 = 255.61/x
  3. Step 3: Cross multiply
    283.85x = 390.91 × 255.61
  4. Step 4: Simplify right side
    283.85x = 99,918.10
  5. Step 5: Solve for x
    x = 99,918.10/283.85
  6. Step 6: Final answer
    x = 352.00

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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.