Home / 39,895.12-55,054.65-21,989.80

Finding the Fourth Proportional to 39,895.12, 55,054.65 and 21,989.80

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Solution

The fourth proportional to 39,895.12, 55,054.65 and 21,989.80 is: 30,345.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,895.12 : 55,054.65 = 21,989.80 : x
  2. Step 2: Convert to fraction form
    39,895.12/55,054.65 = 21,989.80/x
  3. Step 3: Cross multiply
    39,895.12x = 55,054.65 × 21,989.80
  4. Step 4: Simplify right side
    39,895.12x = 1,210,640,742.57
  5. Step 5: Solve for x
    x = 1,210,640,742.57/39,895.12
  6. Step 6: Final answer
    x = 30,345.58

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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.