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Finding the Fourth Proportional to 291.40, 401.82 and 187.84

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Solution

The fourth proportional to 291.40, 401.82 and 187.84 is: 259.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.40 : 401.82 = 187.84 : x
  2. Step 2: Convert to fraction form
    291.40/401.82 = 187.84/x
  3. Step 3: Cross multiply
    291.40x = 401.82 × 187.84
  4. Step 4: Simplify right side
    291.40x = 75,477.87
  5. Step 5: Solve for x
    x = 75,477.87/291.40
  6. Step 6: Final answer
    x = 259.02

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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.