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Finding the Fourth Proportional to 255.85, 383.30 and 147.31

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Solution

The fourth proportional to 255.85, 383.30 and 147.31 is: 220.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.85 : 383.30 = 147.31 : x
  2. Step 2: Convert to fraction form
    255.85/383.30 = 147.31/x
  3. Step 3: Cross multiply
    255.85x = 383.30 × 147.31
  4. Step 4: Simplify right side
    255.85x = 56,463.92
  5. Step 5: Solve for x
    x = 56,463.92/255.85
  6. Step 6: Final answer
    x = 220.69

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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.