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Finding the Fourth Proportional to 290.46, 400.40 and 257.66

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Solution

The fourth proportional to 290.46, 400.40 and 257.66 is: 355.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.46 : 400.40 = 257.66 : x
  2. Step 2: Convert to fraction form
    290.46/400.40 = 257.66/x
  3. Step 3: Cross multiply
    290.46x = 400.40 × 257.66
  4. Step 4: Simplify right side
    290.46x = 103,167.06
  5. Step 5: Solve for x
    x = 103,167.06/290.46
  6. Step 6: Final answer
    x = 355.19

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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.