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Finding the Fourth Proportional to 304.13, 420.49 and 290.53

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Solution

The fourth proportional to 304.13, 420.49 and 290.53 is: 401.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.13 : 420.49 = 290.53 : x
  2. Step 2: Convert to fraction form
    304.13/420.49 = 290.53/x
  3. Step 3: Cross multiply
    304.13x = 420.49 × 290.53
  4. Step 4: Simplify right side
    304.13x = 122,163.58
  5. Step 5: Solve for x
    x = 122,163.58/304.13
  6. Step 6: Final answer
    x = 401.69

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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.