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Finding the Fourth Proportional to 161.02, 240.44 and 128.16

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Solution

The fourth proportional to 161.02, 240.44 and 128.16 is: 191.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.02 : 240.44 = 128.16 : x
  2. Step 2: Convert to fraction form
    161.02/240.44 = 128.16/x
  3. Step 3: Cross multiply
    161.02x = 240.44 × 128.16
  4. Step 4: Simplify right side
    161.02x = 30,814.79
  5. Step 5: Solve for x
    x = 30,814.79/161.02
  6. Step 6: Final answer
    x = 191.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.