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Finding the Fourth Proportional to 291.75, 437.45 and 137.72

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Solution

The fourth proportional to 291.75, 437.45 and 137.72 is: 206.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.75 : 437.45 = 137.72 : x
  2. Step 2: Convert to fraction form
    291.75/437.45 = 137.72/x
  3. Step 3: Cross multiply
    291.75x = 437.45 × 137.72
  4. Step 4: Simplify right side
    291.75x = 60,242.74
  5. Step 5: Solve for x
    x = 60,242.74/291.75
  6. Step 6: Final answer
    x = 206.49

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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.