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Finding the Fourth Proportional to 255.99, 384.73 and 212.93

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Solution

The fourth proportional to 255.99, 384.73 and 212.93 is: 320.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.99 : 384.73 = 212.93 : x
  2. Step 2: Convert to fraction form
    255.99/384.73 = 212.93/x
  3. Step 3: Cross multiply
    255.99x = 384.73 × 212.93
  4. Step 4: Simplify right side
    255.99x = 81,920.56
  5. Step 5: Solve for x
    x = 81,920.56/255.99
  6. Step 6: Final answer
    x = 320.01

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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.