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Finding the Fourth Proportional to 291.90, 401.98 and 285.83

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Solution

The fourth proportional to 291.90, 401.98 and 285.83 is: 393.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.90 : 401.98 = 285.83 : x
  2. Step 2: Convert to fraction form
    291.90/401.98 = 285.83/x
  3. Step 3: Cross multiply
    291.90x = 401.98 × 285.83
  4. Step 4: Simplify right side
    291.90x = 114,894.50
  5. Step 5: Solve for x
    x = 114,894.50/291.90
  6. Step 6: Final answer
    x = 393.61

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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.