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Finding the Fourth Proportional to 290.51, 401.05 and 220.58

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Solution

The fourth proportional to 290.51, 401.05 and 220.58 is: 304.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.51 : 401.05 = 220.58 : x
  2. Step 2: Convert to fraction form
    290.51/401.05 = 220.58/x
  3. Step 3: Cross multiply
    290.51x = 401.05 × 220.58
  4. Step 4: Simplify right side
    290.51x = 88,463.61
  5. Step 5: Solve for x
    x = 88,463.61/290.51
  6. Step 6: Final answer
    x = 304.51

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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.