Home / 39,890.96-55,052.69-21,989.15

Finding the Fourth Proportional to 39,890.96, 55,052.69 and 21,989.15

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Solution

The fourth proportional to 39,890.96, 55,052.69 and 21,989.15 is: 30,346.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.96 : 55,052.69 = 21,989.15 : x
  2. Step 2: Convert to fraction form
    39,890.96/55,052.69 = 21,989.15/x
  3. Step 3: Cross multiply
    39,890.96x = 55,052.69 × 21,989.15
  4. Step 4: Simplify right side
    39,890.96x = 1,210,561,858.31
  5. Step 5: Solve for x
    x = 1,210,561,858.31/39,890.96
  6. Step 6: Final answer
    x = 30,346.77

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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.