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Finding the Fourth Proportional to 290.16, 435.38 and 128.03

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Solution

The fourth proportional to 290.16, 435.38 and 128.03 is: 192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.16 : 435.38 = 128.03 : x
  2. Step 2: Convert to fraction form
    290.16/435.38 = 128.03/x
  3. Step 3: Cross multiply
    290.16x = 435.38 × 128.03
  4. Step 4: Simplify right side
    290.16x = 55,738.88
  5. Step 5: Solve for x
    x = 55,738.88/290.16
  6. Step 6: Final answer
    x = 192.10

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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.