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Finding the Fourth Proportional to 679.17, 1,018.71 and 192.21

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Solution

The fourth proportional to 679.17, 1,018.71 and 192.21 is: 288.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.17 : 1,018.71 = 192.21 : x
  2. Step 2: Convert to fraction form
    679.17/1,018.71 = 192.21/x
  3. Step 3: Cross multiply
    679.17x = 1,018.71 × 192.21
  4. Step 4: Simplify right side
    679.17x = 195,806.25
  5. Step 5: Solve for x
    x = 195,806.25/679.17
  6. Step 6: Final answer
    x = 288.30

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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.