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Finding the Fourth Proportional to 1,626.09, 2,439.50 and 639.00

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Solution

The fourth proportional to 1,626.09, 2,439.50 and 639.00 is: 958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,626.09 : 2,439.50 = 639.00 : x
  2. Step 2: Convert to fraction form
    1,626.09/2,439.50 = 639.00/x
  3. Step 3: Cross multiply
    1,626.09x = 2,439.50 × 639.00
  4. Step 4: Simplify right side
    1,626.09x = 1,558,851.25
  5. Step 5: Solve for x
    x = 1,558,851.25/1,626.09
  6. Step 6: Final answer
    x = 958.65

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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.