Home / 30,620.78-42,261.30-18,691.06

Finding the Fourth Proportional to 30,620.78, 42,261.30 and 18,691.06

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Solution

The fourth proportional to 30,620.78, 42,261.30 and 18,691.06 is: 25,796.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,620.78 : 42,261.30 = 18,691.06 : x
  2. Step 2: Convert to fraction form
    30,620.78/42,261.30 = 18,691.06/x
  3. Step 3: Cross multiply
    30,620.78x = 42,261.30 × 18,691.06
  4. Step 4: Simplify right side
    30,620.78x = 789,908,493.98
  5. Step 5: Solve for x
    x = 789,908,493.98/30,620.78
  6. Step 6: Final answer
    x = 25,796.49

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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.