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Finding the Fourth Proportional to 12,471.90, 18,671.40 and 12,107.40

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Solution

The fourth proportional to 12,471.90, 18,671.40 and 12,107.40 is: 18,125.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,471.90 : 18,671.40 = 12,107.40 : x
  2. Step 2: Convert to fraction form
    12,471.90/18,671.40 = 12,107.40/x
  3. Step 3: Cross multiply
    12,471.90x = 18,671.40 × 12,107.40
  4. Step 4: Simplify right side
    12,471.90x = 226,062,108.36
  5. Step 5: Solve for x
    x = 226,062,108.36/12,471.90
  6. Step 6: Final answer
    x = 18,125.72

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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.