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Finding the Fourth Proportional to 259.92, 389.58 and 214.05

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Solution

The fourth proportional to 259.92, 389.58 and 214.05 is: 320.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.92 : 389.58 = 214.05 : x
  2. Step 2: Convert to fraction form
    259.92/389.58 = 214.05/x
  3. Step 3: Cross multiply
    259.92x = 389.58 × 214.05
  4. Step 4: Simplify right side
    259.92x = 83,389.60
  5. Step 5: Solve for x
    x = 83,389.60/259.92
  6. Step 6: Final answer
    x = 320.83

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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.