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Finding the Fourth Proportional to 259.83, 389.88 and 208.67

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Solution

The fourth proportional to 259.83, 389.88 and 208.67 is: 313.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.83 : 389.88 = 208.67 : x
  2. Step 2: Convert to fraction form
    259.83/389.88 = 208.67/x
  3. Step 3: Cross multiply
    259.83x = 389.88 × 208.67
  4. Step 4: Simplify right side
    259.83x = 81,354.31
  5. Step 5: Solve for x
    x = 81,354.31/259.83
  6. Step 6: Final answer
    x = 313.11

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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.