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Finding the Fourth Proportional to 30,799.41, 42,487.90 and 19,893.79

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Solution

The fourth proportional to 30,799.41, 42,487.90 and 19,893.79 is: 27,443.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,799.41 : 42,487.90 = 19,893.79 : x
  2. Step 2: Convert to fraction form
    30,799.41/42,487.90 = 19,893.79/x
  3. Step 3: Cross multiply
    30,799.41x = 42,487.90 × 19,893.79
  4. Step 4: Simplify right side
    30,799.41x = 845,245,363.52
  5. Step 5: Solve for x
    x = 845,245,363.52/30,799.41
  6. Step 6: Final answer
    x = 27,443.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.