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Finding the Fourth Proportional to 290.69, 435.88 and 128.49

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Solution

The fourth proportional to 290.69, 435.88 and 128.49 is: 192.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.69 : 435.88 = 128.49 : x
  2. Step 2: Convert to fraction form
    290.69/435.88 = 128.49/x
  3. Step 3: Cross multiply
    290.69x = 435.88 × 128.49
  4. Step 4: Simplify right side
    290.69x = 56,004.75
  5. Step 5: Solve for x
    x = 56,004.75/290.69
  6. Step 6: Final answer
    x = 192.66

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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.