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Finding the Fourth Proportional to 183.69, 253.06 and 128.34

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Solution

The fourth proportional to 183.69, 253.06 and 128.34 is: 176.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.69 : 253.06 = 128.34 : x
  2. Step 2: Convert to fraction form
    183.69/253.06 = 128.34/x
  3. Step 3: Cross multiply
    183.69x = 253.06 × 128.34
  4. Step 4: Simplify right side
    183.69x = 32,477.72
  5. Step 5: Solve for x
    x = 32,477.72/183.69
  6. Step 6: Final answer
    x = 176.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.