Home / 28,979.56-39,979.74-19,531.72

Finding the Fourth Proportional to 28,979.56, 39,979.74 and 19,531.72

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Solution

The fourth proportional to 28,979.56, 39,979.74 and 19,531.72 is: 26,945.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,979.56 : 39,979.74 = 19,531.72 : x
  2. Step 2: Convert to fraction form
    28,979.56/39,979.74 = 19,531.72/x
  3. Step 3: Cross multiply
    28,979.56x = 39,979.74 × 19,531.72
  4. Step 4: Simplify right side
    28,979.56x = 780,873,087.35
  5. Step 5: Solve for x
    x = 780,873,087.35/28,979.56
  6. Step 6: Final answer
    x = 26,945.65

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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.