Home / 20,431.31-28,195.93-11,478.63

Finding the Fourth Proportional to 20,431.31, 28,195.93 and 11,478.63

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Solution

The fourth proportional to 20,431.31, 28,195.93 and 11,478.63 is: 15,840.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.31 : 28,195.93 = 11,478.63 : x
  2. Step 2: Convert to fraction form
    20,431.31/28,195.93 = 11,478.63/x
  3. Step 3: Cross multiply
    20,431.31x = 28,195.93 × 11,478.63
  4. Step 4: Simplify right side
    20,431.31x = 323,650,647.98
  5. Step 5: Solve for x
    x = 323,650,647.98/20,431.31
  6. Step 6: Final answer
    x = 15,840.92

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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.