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Finding the Fourth Proportional to 291.03, 436.40 and 85.54

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Solution

The fourth proportional to 291.03, 436.40 and 85.54 is: 128.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.03 : 436.40 = 85.54 : x
  2. Step 2: Convert to fraction form
    291.03/436.40 = 85.54/x
  3. Step 3: Cross multiply
    291.03x = 436.40 × 85.54
  4. Step 4: Simplify right side
    291.03x = 37,329.66
  5. Step 5: Solve for x
    x = 37,329.66/291.03
  6. Step 6: Final answer
    x = 128.27

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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.