Home / 13,431.78-20,012.67-12,677.25

Finding the Fourth Proportional to 13,431.78, 20,012.67 and 12,677.25

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Solution

The fourth proportional to 13,431.78, 20,012.67 and 12,677.25 is: 18,888.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.78 : 20,012.67 = 12,677.25 : x
  2. Step 2: Convert to fraction form
    13,431.78/20,012.67 = 12,677.25/x
  3. Step 3: Cross multiply
    13,431.78x = 20,012.67 × 12,677.25
  4. Step 4: Simplify right side
    13,431.78x = 253,705,620.76
  5. Step 5: Solve for x
    x = 253,705,620.76/13,431.78
  6. Step 6: Final answer
    x = 18,888.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.