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Finding the Fourth Proportional to 30,872.92, 42,606.60 and 18,934.63

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Solution

The fourth proportional to 30,872.92, 42,606.60 and 18,934.63 is: 26,131.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,872.92 : 42,606.60 = 18,934.63 : x
  2. Step 2: Convert to fraction form
    30,872.92/42,606.60 = 18,934.63/x
  3. Step 3: Cross multiply
    30,872.92x = 42,606.60 × 18,934.63
  4. Step 4: Simplify right side
    30,872.92x = 806,740,206.56
  5. Step 5: Solve for x
    x = 806,740,206.56/30,872.92
  6. Step 6: Final answer
    x = 26,131.00

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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.