Home / 30,928.58-42,716.22-20,839.36

Finding the Fourth Proportional to 30,928.58, 42,716.22 and 20,839.36

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Solution

The fourth proportional to 30,928.58, 42,716.22 and 20,839.36 is: 28,781.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,928.58 : 42,716.22 = 20,839.36 : x
  2. Step 2: Convert to fraction form
    30,928.58/42,716.22 = 20,839.36/x
  3. Step 3: Cross multiply
    30,928.58x = 42,716.22 × 20,839.36
  4. Step 4: Simplify right side
    30,928.58x = 890,178,686.42
  5. Step 5: Solve for x
    x = 890,178,686.42/30,928.58
  6. Step 6: Final answer
    x = 28,781.75

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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.