Home / 30,939.21-42,663.82-18,361.53

Finding the Fourth Proportional to 30,939.21, 42,663.82 and 18,361.53

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Solution

The fourth proportional to 30,939.21, 42,663.82 and 18,361.53 is: 25,319.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.21 : 42,663.82 = 18,361.53 : x
  2. Step 2: Convert to fraction form
    30,939.21/42,663.82 = 18,361.53/x
  3. Step 3: Cross multiply
    30,939.21x = 42,663.82 × 18,361.53
  4. Step 4: Simplify right side
    30,939.21x = 783,373,010.84
  5. Step 5: Solve for x
    x = 783,373,010.84/30,939.21
  6. Step 6: Final answer
    x = 25,319.75

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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.