Home / 39,905.09-55,069.18-21,999.74

Finding the Fourth Proportional to 39,905.09, 55,069.18 and 21,999.74

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Solution

The fourth proportional to 39,905.09, 55,069.18 and 21,999.74 is: 30,359.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,905.09 : 55,069.18 = 21,999.74 : x
  2. Step 2: Convert to fraction form
    39,905.09/55,069.18 = 21,999.74/x
  3. Step 3: Cross multiply
    39,905.09x = 55,069.18 × 21,999.74
  4. Step 4: Simplify right side
    39,905.09x = 1,211,507,642.01
  5. Step 5: Solve for x
    x = 1,211,507,642.01/39,905.09
  6. Step 6: Final answer
    x = 30,359.73

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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.