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Finding the Fourth Proportional to 18,788.81, 28,180.16 and 5,638.86

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Solution

The fourth proportional to 18,788.81, 28,180.16 and 5,638.86 is: 8,457.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,788.81 : 28,180.16 = 5,638.86 : x
  2. Step 2: Convert to fraction form
    18,788.81/28,180.16 = 5,638.86/x
  3. Step 3: Cross multiply
    18,788.81x = 28,180.16 × 5,638.86
  4. Step 4: Simplify right side
    18,788.81x = 158,903,991.11
  5. Step 5: Solve for x
    x = 158,903,991.11/18,788.81
  6. Step 6: Final answer
    x = 8,457.38

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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.