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Finding the Fourth Proportional to 18,821.12, 28,230.80 and 7,725.06

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Solution

The fourth proportional to 18,821.12, 28,230.80 and 7,725.06 is: 11,587.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.12 : 28,230.80 = 7,725.06 : x
  2. Step 2: Convert to fraction form
    18,821.12/28,230.80 = 7,725.06/x
  3. Step 3: Cross multiply
    18,821.12x = 28,230.80 × 7,725.06
  4. Step 4: Simplify right side
    18,821.12x = 218,084,585.22
  5. Step 5: Solve for x
    x = 218,084,585.22/18,821.12
  6. Step 6: Final answer
    x = 11,587.23

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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.