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Finding the Fourth Proportional to 291.44, 436.80 and 154.28

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Solution

The fourth proportional to 291.44, 436.80 and 154.28 is: 231.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.44 : 436.80 = 154.28 : x
  2. Step 2: Convert to fraction form
    291.44/436.80 = 154.28/x
  3. Step 3: Cross multiply
    291.44x = 436.80 × 154.28
  4. Step 4: Simplify right side
    291.44x = 67,389.50
  5. Step 5: Solve for x
    x = 67,389.50/291.44
  6. Step 6: Final answer
    x = 231.23

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Why These Related Problems?

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