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Finding the Fourth Proportional to 291.36, 439.44 and 259.68

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Solution

The fourth proportional to 291.36, 439.44 and 259.68 is: 391.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.36 : 439.44 = 259.68 : x
  2. Step 2: Convert to fraction form
    291.36/439.44 = 259.68/x
  3. Step 3: Cross multiply
    291.36x = 439.44 × 259.68
  4. Step 4: Simplify right side
    291.36x = 114,113.78
  5. Step 5: Solve for x
    x = 114,113.78/291.36
  6. Step 6: Final answer
    x = 391.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.