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Finding the Fourth Proportional to 18,745.72, 28,119.08 and 8,210.32

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Solution

The fourth proportional to 18,745.72, 28,119.08 and 8,210.32 is: 12,315.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.72 : 28,119.08 = 8,210.32 : x
  2. Step 2: Convert to fraction form
    18,745.72/28,119.08 = 8,210.32/x
  3. Step 3: Cross multiply
    18,745.72x = 28,119.08 × 8,210.32
  4. Step 4: Simplify right side
    18,745.72x = 230,866,644.91
  5. Step 5: Solve for x
    x = 230,866,644.91/18,745.72
  6. Step 6: Final answer
    x = 12,315.70

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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.