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Finding the Fourth Proportional to 20,995.94, 31,493.95 and 19,712.90

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Solution

The fourth proportional to 20,995.94, 31,493.95 and 19,712.90 is: 29,569.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.94 : 31,493.95 = 19,712.90 : x
  2. Step 2: Convert to fraction form
    20,995.94/31,493.95 = 19,712.90/x
  3. Step 3: Cross multiply
    20,995.94x = 31,493.95 × 19,712.90
  4. Step 4: Simplify right side
    20,995.94x = 620,837,116.41
  5. Step 5: Solve for x
    x = 620,837,116.41/20,995.94
  6. Step 6: Final answer
    x = 29,569.39

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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.