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Finding the Fourth Proportional to 18,879.18, 28,318.74 and 8,478.78

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Solution

The fourth proportional to 18,879.18, 28,318.74 and 8,478.78 is: 12,718.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.18 : 28,318.74 = 8,478.78 : x
  2. Step 2: Convert to fraction form
    18,879.18/28,318.74 = 8,478.78/x
  3. Step 3: Cross multiply
    18,879.18x = 28,318.74 × 8,478.78
  4. Step 4: Simplify right side
    18,879.18x = 240,108,366.34
  5. Step 5: Solve for x
    x = 240,108,366.34/18,879.18
  6. Step 6: Final answer
    x = 12,718.16

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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.