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Finding the Fourth Proportional to 18,878.08, 28,318.08 and 7,189.12

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Solution

The fourth proportional to 18,878.08, 28,318.08 and 7,189.12 is: 10,784.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.08 : 28,318.08 = 7,189.12 : x
  2. Step 2: Convert to fraction form
    18,878.08/28,318.08 = 7,189.12/x
  3. Step 3: Cross multiply
    18,878.08x = 28,318.08 × 7,189.12
  4. Step 4: Simplify right side
    18,878.08x = 203,582,075.29
  5. Step 5: Solve for x
    x = 203,582,075.29/18,878.08
  6. Step 6: Final answer
    x = 10,784.05

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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.