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Finding the Fourth Proportional to 255.61, 383.60 and 147.61

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Solution

The fourth proportional to 255.61, 383.60 and 147.61 is: 221.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.61 : 383.60 = 147.61 : x
  2. Step 2: Convert to fraction form
    255.61/383.60 = 147.61/x
  3. Step 3: Cross multiply
    255.61x = 383.60 × 147.61
  4. Step 4: Simplify right side
    255.61x = 56,623.20
  5. Step 5: Solve for x
    x = 56,623.20/255.61
  6. Step 6: Final answer
    x = 221.52

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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.