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Finding the Fourth Proportional to 679.40, 1,019.05 and 217.51

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Solution

The fourth proportional to 679.40, 1,019.05 and 217.51 is: 326.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.40 : 1,019.05 = 217.51 : x
  2. Step 2: Convert to fraction form
    679.40/1,019.05 = 217.51/x
  3. Step 3: Cross multiply
    679.40x = 1,019.05 × 217.51
  4. Step 4: Simplify right side
    679.40x = 221,653.57
  5. Step 5: Solve for x
    x = 221,653.57/679.40
  6. Step 6: Final answer
    x = 326.25

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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.