Home / 30,453.09-42,009.87-20,381.95

Finding the Fourth Proportional to 30,453.09, 42,009.87 and 20,381.95

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Solution

The fourth proportional to 30,453.09, 42,009.87 and 20,381.95 is: 28,116.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,453.09 : 42,009.87 = 20,381.95 : x
  2. Step 2: Convert to fraction form
    30,453.09/42,009.87 = 20,381.95/x
  3. Step 3: Cross multiply
    30,453.09x = 42,009.87 × 20,381.95
  4. Step 4: Simplify right side
    30,453.09x = 856,243,069.85
  5. Step 5: Solve for x
    x = 856,243,069.85/30,453.09
  6. Step 6: Final answer
    x = 28,116.79

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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.