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Finding the Fourth Proportional to 1,679.79, 2,519.71 and 639.29

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Solution

The fourth proportional to 1,679.79, 2,519.71 and 639.29 is: 958.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.79 : 2,519.71 = 639.29 : x
  2. Step 2: Convert to fraction form
    1,679.79/2,519.71 = 639.29/x
  3. Step 3: Cross multiply
    1,679.79x = 2,519.71 × 639.29
  4. Step 4: Simplify right side
    1,679.79x = 1,610,830.11
  5. Step 5: Solve for x
    x = 1,610,830.11/1,679.79
  6. Step 6: Final answer
    x = 958.95

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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.