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Finding the Fourth Proportional to 290.76, 438.18 and 261.90

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Solution

The fourth proportional to 290.76, 438.18 and 261.90 is: 394.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.76 : 438.18 = 261.90 : x
  2. Step 2: Convert to fraction form
    290.76/438.18 = 261.90/x
  3. Step 3: Cross multiply
    290.76x = 438.18 × 261.90
  4. Step 4: Simplify right side
    290.76x = 114,759.34
  5. Step 5: Solve for x
    x = 114,759.34/290.76
  6. Step 6: Final answer
    x = 394.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.