Home / 30,938.11-42,668.23-20,853.30

Finding the Fourth Proportional to 30,938.11, 42,668.23 and 20,853.30

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Solution

The fourth proportional to 30,938.11, 42,668.23 and 20,853.30 is: 28,759.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,938.11 : 42,668.23 = 20,853.30 : x
  2. Step 2: Convert to fraction form
    30,938.11/42,668.23 = 20,853.30/x
  3. Step 3: Cross multiply
    30,938.11x = 42,668.23 × 20,853.30
  4. Step 4: Simplify right side
    30,938.11x = 889,773,400.66
  5. Step 5: Solve for x
    x = 889,773,400.66/30,938.11
  6. Step 6: Final answer
    x = 28,759.79

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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.