Home / 20,611.51-28,443.76-11,179.87

Finding the Fourth Proportional to 20,611.51, 28,443.76 and 11,179.87

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Solution

The fourth proportional to 20,611.51, 28,443.76 and 11,179.87 is: 15,428.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.51 : 28,443.76 = 11,179.87 : x
  2. Step 2: Convert to fraction form
    20,611.51/28,443.76 = 11,179.87/x
  3. Step 3: Cross multiply
    20,611.51x = 28,443.76 × 11,179.87
  4. Step 4: Simplify right side
    20,611.51x = 317,997,539.11
  5. Step 5: Solve for x
    x = 317,997,539.11/20,611.51
  6. Step 6: Final answer
    x = 15,428.15

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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.