Home / 20,820.33-28,731.34-11,870.72

Finding the Fourth Proportional to 20,820.33, 28,731.34 and 11,870.72

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Solution

The fourth proportional to 20,820.33, 28,731.34 and 11,870.72 is: 16,381.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.33 : 28,731.34 = 11,870.72 : x
  2. Step 2: Convert to fraction form
    20,820.33/28,731.34 = 11,870.72/x
  3. Step 3: Cross multiply
    20,820.33x = 28,731.34 × 11,870.72
  4. Step 4: Simplify right side
    20,820.33x = 341,061,692.36
  5. Step 5: Solve for x
    x = 341,061,692.36/20,820.33
  6. Step 6: Final answer
    x = 16,381.19

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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.