Home / 28,730.39-39,672.87-21,189.80

Finding the Fourth Proportional to 28,730.39, 39,672.87 and 21,189.80

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Solution

The fourth proportional to 28,730.39, 39,672.87 and 21,189.80 is: 29,260.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,730.39 : 39,672.87 = 21,189.80 : x
  2. Step 2: Convert to fraction form
    28,730.39/39,672.87 = 21,189.80/x
  3. Step 3: Cross multiply
    28,730.39x = 39,672.87 × 21,189.80
  4. Step 4: Simplify right side
    28,730.39x = 840,659,982.36
  5. Step 5: Solve for x
    x = 840,659,982.36/28,730.39
  6. Step 6: Final answer
    x = 29,260.31

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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.