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Finding the Fourth Proportional to 18,695.90, 28,048.80 and 8,161.40

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Solution

The fourth proportional to 18,695.90, 28,048.80 and 8,161.40 is: 12,244.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,695.90 : 28,048.80 = 8,161.40 : x
  2. Step 2: Convert to fraction form
    18,695.90/28,048.80 = 8,161.40/x
  3. Step 3: Cross multiply
    18,695.90x = 28,048.80 × 8,161.40
  4. Step 4: Simplify right side
    18,695.90x = 228,917,476.32
  5. Step 5: Solve for x
    x = 228,917,476.32/18,695.90
  6. Step 6: Final answer
    x = 12,244.26

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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.