Home / 30,968.12-42,770.88-20,938.04

Finding the Fourth Proportional to 30,968.12, 42,770.88 and 20,938.04

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Solution

The fourth proportional to 30,968.12, 42,770.88 and 20,938.04 is: 28,918.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,968.12 : 42,770.88 = 20,938.04 : x
  2. Step 2: Convert to fraction form
    30,968.12/42,770.88 = 20,938.04/x
  3. Step 3: Cross multiply
    30,968.12x = 42,770.88 × 20,938.04
  4. Step 4: Simplify right side
    30,968.12x = 895,538,396.28
  5. Step 5: Solve for x
    x = 895,538,396.28/30,968.12
  6. Step 6: Final answer
    x = 28,918.07

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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.