Home / 18,821.04-28,009.80-18,121.20

Finding the Fourth Proportional to 18,821.04, 28,009.80 and 18,121.20

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Solution

The fourth proportional to 18,821.04, 28,009.80 and 18,121.20 is: 26,968.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.04 : 28,009.80 = 18,121.20 : x
  2. Step 2: Convert to fraction form
    18,821.04/28,009.80 = 18,121.20/x
  3. Step 3: Cross multiply
    18,821.04x = 28,009.80 × 18,121.20
  4. Step 4: Simplify right side
    18,821.04x = 507,571,187.76
  5. Step 5: Solve for x
    x = 507,571,187.76/18,821.04
  6. Step 6: Final answer
    x = 26,968.29

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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.