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Finding the Fourth Proportional to 183.53, 253.13 and 128.21

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Solution

The fourth proportional to 183.53, 253.13 and 128.21 is: 176.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.53 : 253.13 = 128.21 : x
  2. Step 2: Convert to fraction form
    183.53/253.13 = 128.21/x
  3. Step 3: Cross multiply
    183.53x = 253.13 × 128.21
  4. Step 4: Simplify right side
    183.53x = 32,451.89
  5. Step 5: Solve for x
    x = 32,451.89/183.53
  6. Step 6: Final answer
    x = 176.83

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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.