Home / 21,138.86-29,112.58-20,679.59

Finding the Fourth Proportional to 21,138.86, 29,112.58 and 20,679.59

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Solution

The fourth proportional to 21,138.86, 29,112.58 and 20,679.59 is: 28,480.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.86 : 29,112.58 = 20,679.59 : x
  2. Step 2: Convert to fraction form
    21,138.86/29,112.58 = 20,679.59/x
  3. Step 3: Cross multiply
    21,138.86x = 29,112.58 × 20,679.59
  4. Step 4: Simplify right side
    21,138.86x = 602,036,316.87
  5. Step 5: Solve for x
    x = 602,036,316.87/21,138.86
  6. Step 6: Final answer
    x = 28,480.07

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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.