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Finding the Fourth Proportional to 255.47, 383.31 and 118.51

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Solution

The fourth proportional to 255.47, 383.31 and 118.51 is: 177.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.47 : 383.31 = 118.51 : x
  2. Step 2: Convert to fraction form
    255.47/383.31 = 118.51/x
  3. Step 3: Cross multiply
    255.47x = 383.31 × 118.51
  4. Step 4: Simplify right side
    255.47x = 45,425.11
  5. Step 5: Solve for x
    x = 45,425.11/255.47
  6. Step 6: Final answer
    x = 177.81

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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.