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Finding the Fourth Proportional to 291.09, 401.72 and 186.21

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Solution

The fourth proportional to 291.09, 401.72 and 186.21 is: 256.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.09 : 401.72 = 186.21 : x
  2. Step 2: Convert to fraction form
    291.09/401.72 = 186.21/x
  3. Step 3: Cross multiply
    291.09x = 401.72 × 186.21
  4. Step 4: Simplify right side
    291.09x = 74,803.35
  5. Step 5: Solve for x
    x = 74,803.35/291.09
  6. Step 6: Final answer
    x = 256.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.