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Finding the Fourth Proportional to 1,679.64, 2,518.68 and 639.36

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Solution

The fourth proportional to 1,679.64, 2,518.68 and 639.36 is: 958.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.64 : 2,518.68 = 639.36 : x
  2. Step 2: Convert to fraction form
    1,679.64/2,518.68 = 639.36/x
  3. Step 3: Cross multiply
    1,679.64x = 2,518.68 × 639.36
  4. Step 4: Simplify right side
    1,679.64x = 1,610,343.24
  5. Step 5: Solve for x
    x = 1,610,343.24/1,679.64
  6. Step 6: Final answer
    x = 958.74

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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.