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Finding the Fourth Proportional to 291.08, 436.46 and 139.08

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Solution

The fourth proportional to 291.08, 436.46 and 139.08 is: 208.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.08 : 436.46 = 139.08 : x
  2. Step 2: Convert to fraction form
    291.08/436.46 = 139.08/x
  3. Step 3: Cross multiply
    291.08x = 436.46 × 139.08
  4. Step 4: Simplify right side
    291.08x = 60,702.86
  5. Step 5: Solve for x
    x = 60,702.86/291.08
  6. Step 6: Final answer
    x = 208.54

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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.