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Finding the Fourth Proportional to 259.70, 390.36 and 236.21

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Solution

The fourth proportional to 259.70, 390.36 and 236.21 is: 355.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.70 : 390.36 = 236.21 : x
  2. Step 2: Convert to fraction form
    259.70/390.36 = 236.21/x
  3. Step 3: Cross multiply
    259.70x = 390.36 × 236.21
  4. Step 4: Simplify right side
    259.70x = 92,206.94
  5. Step 5: Solve for x
    x = 92,206.94/259.70
  6. Step 6: Final answer
    x = 355.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.