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Finding the Fourth Proportional to 255.53, 383.21 and 72.87

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Solution

The fourth proportional to 255.53, 383.21 and 72.87 is: 109.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.53 : 383.21 = 72.87 : x
  2. Step 2: Convert to fraction form
    255.53/383.21 = 72.87/x
  3. Step 3: Cross multiply
    255.53x = 383.21 × 72.87
  4. Step 4: Simplify right side
    255.53x = 27,924.51
  5. Step 5: Solve for x
    x = 27,924.51/255.53
  6. Step 6: Final answer
    x = 109.28

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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.