Home / 15,408.96-21,125.61-15,128.70

Finding the Fourth Proportional to 15,408.96, 21,125.61 and 15,128.70

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Solution

The fourth proportional to 15,408.96, 21,125.61 and 15,128.70 is: 20,741.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,408.96 : 21,125.61 = 15,128.70 : x
  2. Step 2: Convert to fraction form
    15,408.96/21,125.61 = 15,128.70/x
  3. Step 3: Cross multiply
    15,408.96x = 21,125.61 × 15,128.70
  4. Step 4: Simplify right side
    15,408.96x = 319,603,016.01
  5. Step 5: Solve for x
    x = 319,603,016.01/15,408.96
  6. Step 6: Final answer
    x = 20,741.37

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.