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Finding the Fourth Proportional to 40,236.90, 55,581.03 and 30,921.90

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Solution

The fourth proportional to 40,236.90, 55,581.03 and 30,921.90 is: 42,713.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,236.90 : 55,581.03 = 30,921.90 : x
  2. Step 2: Convert to fraction form
    40,236.90/55,581.03 = 30,921.90/x
  3. Step 3: Cross multiply
    40,236.90x = 55,581.03 × 30,921.90
  4. Step 4: Simplify right side
    40,236.90x = 1,718,671,051.56
  5. Step 5: Solve for x
    x = 1,718,671,051.56/40,236.90
  6. Step 6: Final answer
    x = 42,713.80

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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.