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Finding the Fourth Proportional to 18,873.96, 28,315.80 and 7,188.12

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Solution

The fourth proportional to 18,873.96, 28,315.80 and 7,188.12 is: 10,784.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.96 : 28,315.80 = 7,188.12 : x
  2. Step 2: Convert to fraction form
    18,873.96/28,315.80 = 7,188.12/x
  3. Step 3: Cross multiply
    18,873.96x = 28,315.80 × 7,188.12
  4. Step 4: Simplify right side
    18,873.96x = 203,537,368.30
  5. Step 5: Solve for x
    x = 203,537,368.30/18,873.96
  6. Step 6: Final answer
    x = 10,784.03

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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.