Home / 20,939.87-28,887.19-12,442.25

Finding the Fourth Proportional to 20,939.87, 28,887.19 and 12,442.25

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Solution

The fourth proportional to 20,939.87, 28,887.19 and 12,442.25 is: 17,164.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.87 : 28,887.19 = 12,442.25 : x
  2. Step 2: Convert to fraction form
    20,939.87/28,887.19 = 12,442.25/x
  3. Step 3: Cross multiply
    20,939.87x = 28,887.19 × 12,442.25
  4. Step 4: Simplify right side
    20,939.87x = 359,421,680.89
  5. Step 5: Solve for x
    x = 359,421,680.89/20,939.87
  6. Step 6: Final answer
    x = 17,164.46

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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.