Home / 30,958.20-42,729.12-20,348.82

Finding the Fourth Proportional to 30,958.20, 42,729.12 and 20,348.82

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Solution

The fourth proportional to 30,958.20, 42,729.12 and 20,348.82 is: 28,085.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,958.20 : 42,729.12 = 20,348.82 : x
  2. Step 2: Convert to fraction form
    30,958.20/42,729.12 = 20,348.82/x
  3. Step 3: Cross multiply
    30,958.20x = 42,729.12 × 20,348.82
  4. Step 4: Simplify right side
    30,958.20x = 869,487,171.64
  5. Step 5: Solve for x
    x = 869,487,171.64/30,958.20
  6. Step 6: Final answer
    x = 28,085.84

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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.