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Finding the Fourth Proportional to 291.14, 400.94 and 290.24

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Solution

The fourth proportional to 291.14, 400.94 and 290.24 is: 399.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.14 : 400.94 = 290.24 : x
  2. Step 2: Convert to fraction form
    291.14/400.94 = 290.24/x
  3. Step 3: Cross multiply
    291.14x = 400.94 × 290.24
  4. Step 4: Simplify right side
    291.14x = 116,368.83
  5. Step 5: Solve for x
    x = 116,368.83/291.14
  6. Step 6: Final answer
    x = 399.70

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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.