Home / 55,128.20-82,724.70-20,071.40

Finding the Fourth Proportional to 55,128.20, 82,724.70 and 20,071.40

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Solution

The fourth proportional to 55,128.20, 82,724.70 and 20,071.40 is: 30,118.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,128.20 : 82,724.70 = 20,071.40 : x
  2. Step 2: Convert to fraction form
    55,128.20/82,724.70 = 20,071.40/x
  3. Step 3: Cross multiply
    55,128.20x = 82,724.70 × 20,071.40
  4. Step 4: Simplify right side
    55,128.20x = 1,660,400,543.58
  5. Step 5: Solve for x
    x = 1,660,400,543.58/55,128.20
  6. Step 6: Final answer
    x = 30,118.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.