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Finding the Fourth Proportional to 291.26, 436.93 and 85.79

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Solution

The fourth proportional to 291.26, 436.93 and 85.79 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.26 : 436.93 = 85.79 : x
  2. Step 2: Convert to fraction form
    291.26/436.93 = 85.79/x
  3. Step 3: Cross multiply
    291.26x = 436.93 × 85.79
  4. Step 4: Simplify right side
    291.26x = 37,485.10
  5. Step 5: Solve for x
    x = 37,485.10/291.26
  6. Step 6: Final answer
    x = 128.70

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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.