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Finding the Fourth Proportional to 18,671.85, 28,012.98 and 8,142.81

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Solution

The fourth proportional to 18,671.85, 28,012.98 and 8,142.81 is: 12,216.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,671.85 : 28,012.98 = 8,142.81 : x
  2. Step 2: Convert to fraction form
    18,671.85/28,012.98 = 8,142.81/x
  3. Step 3: Cross multiply
    18,671.85x = 28,012.98 × 8,142.81
  4. Step 4: Simplify right side
    18,671.85x = 228,104,373.67
  5. Step 5: Solve for x
    x = 228,104,373.67/18,671.85
  6. Step 6: Final answer
    x = 12,216.48

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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.