Home / 20,856.78-28,775.31-11,897.98

Finding the Fourth Proportional to 20,856.78, 28,775.31 and 11,897.98

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Solution

The fourth proportional to 20,856.78, 28,775.31 and 11,897.98 is: 16,415.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.78 : 28,775.31 = 11,897.98 : x
  2. Step 2: Convert to fraction form
    20,856.78/28,775.31 = 11,897.98/x
  3. Step 3: Cross multiply
    20,856.78x = 28,775.31 × 11,897.98
  4. Step 4: Simplify right side
    20,856.78x = 342,368,062.87
  5. Step 5: Solve for x
    x = 342,368,062.87/20,856.78
  6. Step 6: Final answer
    x = 16,415.19

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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.