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Finding the Fourth Proportional to 290, 399.54 and 240.74

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Solution

The fourth proportional to 290, 399.54 and 240.74 is: 331.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290 : 399.54 = 240.74 : x
  2. Step 2: Convert to fraction form
    290/399.54 = 240.74/x
  3. Step 3: Cross multiply
    290x = 399.54 × 240.74
  4. Step 4: Simplify right side
    290x = 96,185.26
  5. Step 5: Solve for x
    x = 96,185.26/290
  6. Step 6: Final answer
    x = 331.67

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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.