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Finding the Fourth Proportional to 290.94, 399.10 and 283.74

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Solution

The fourth proportional to 290.94, 399.10 and 283.74 is: 389.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.94 : 399.10 = 283.74 : x
  2. Step 2: Convert to fraction form
    290.94/399.10 = 283.74/x
  3. Step 3: Cross multiply
    290.94x = 399.10 × 283.74
  4. Step 4: Simplify right side
    290.94x = 113,240.63
  5. Step 5: Solve for x
    x = 113,240.63/290.94
  6. Step 6: Final answer
    x = 389.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.