Home / 18,858.40-28,298.80-7,172.80

Finding the Fourth Proportional to 18,858.40, 28,298.80 and 7,172.80

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Solution

The fourth proportional to 18,858.40, 28,298.80 and 7,172.80 is: 10,763.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.40 : 28,298.80 = 7,172.80 : x
  2. Step 2: Convert to fraction form
    18,858.40/28,298.80 = 7,172.80/x
  3. Step 3: Cross multiply
    18,858.40x = 28,298.80 × 7,172.80
  4. Step 4: Simplify right side
    18,858.40x = 202,981,632.64
  5. Step 5: Solve for x
    x = 202,981,632.64/18,858.40
  6. Step 6: Final answer
    x = 10,763.46

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1.5x scale

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.