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Finding the Fourth Proportional to 290.56, 436.12 and 128.30

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Solution

The fourth proportional to 290.56, 436.12 and 128.30 is: 192.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.56 : 436.12 = 128.30 : x
  2. Step 2: Convert to fraction form
    290.56/436.12 = 128.30/x
  3. Step 3: Cross multiply
    290.56x = 436.12 × 128.30
  4. Step 4: Simplify right side
    290.56x = 55,954.20
  5. Step 5: Solve for x
    x = 55,954.20/290.56
  6. Step 6: Final answer
    x = 192.57

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.