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Finding the Fourth Proportional to 255.98, 383.81 and 153.20

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Solution

The fourth proportional to 255.98, 383.81 and 153.20 is: 229.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.98 : 383.81 = 153.20 : x
  2. Step 2: Convert to fraction form
    255.98/383.81 = 153.20/x
  3. Step 3: Cross multiply
    255.98x = 383.81 × 153.20
  4. Step 4: Simplify right side
    255.98x = 58,797.77
  5. Step 5: Solve for x
    x = 58,797.77/255.98
  6. Step 6: Final answer
    x = 229.70

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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.