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Finding the Fourth Proportional to 20,671.20, 31,006.80 and 19,067.40

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Solution

The fourth proportional to 20,671.20, 31,006.80 and 19,067.40 is: 28,601.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,671.20 : 31,006.80 = 19,067.40 : x
  2. Step 2: Convert to fraction form
    20,671.20/31,006.80 = 19,067.40/x
  3. Step 3: Cross multiply
    20,671.20x = 31,006.80 × 19,067.40
  4. Step 4: Simplify right side
    20,671.20x = 591,219,058.32
  5. Step 5: Solve for x
    x = 591,219,058.32/20,671.20
  6. Step 6: Final answer
    x = 28,601.10

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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.