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Finding the Fourth Proportional to 290.22, 435.12 and 143.79

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Solution

The fourth proportional to 290.22, 435.12 and 143.79 is: 215.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.22 : 435.12 = 143.79 : x
  2. Step 2: Convert to fraction form
    290.22/435.12 = 143.79/x
  3. Step 3: Cross multiply
    290.22x = 435.12 × 143.79
  4. Step 4: Simplify right side
    290.22x = 62,565.90
  5. Step 5: Solve for x
    x = 62,565.90/290.22
  6. Step 6: Final answer
    x = 215.58

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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.