Home / 19,789.68-27,328.08-12,728.28

Finding the Fourth Proportional to 19,789.68, 27,328.08 and 12,728.28

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Solution

The fourth proportional to 19,789.68, 27,328.08 and 12,728.28 is: 17,576.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,789.68 : 27,328.08 = 12,728.28 : x
  2. Step 2: Convert to fraction form
    19,789.68/27,328.08 = 12,728.28/x
  3. Step 3: Cross multiply
    19,789.68x = 27,328.08 × 12,728.28
  4. Step 4: Simplify right side
    19,789.68x = 347,839,454.10
  5. Step 5: Solve for x
    x = 347,839,454.10/19,789.68
  6. Step 6: Final answer
    x = 17,576.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.