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Finding the Fourth Proportional to 259.36, 390.62 and 219.04

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Solution

The fourth proportional to 259.36, 390.62 and 219.04 is: 329.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.36 : 390.62 = 219.04 : x
  2. Step 2: Convert to fraction form
    259.36/390.62 = 219.04/x
  3. Step 3: Cross multiply
    259.36x = 390.62 × 219.04
  4. Step 4: Simplify right side
    259.36x = 85,561.40
  5. Step 5: Solve for x
    x = 85,561.40/259.36
  6. Step 6: Final answer
    x = 329.89

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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.