Home / 39,870.96-55,021.79-21,965.81

Finding the Fourth Proportional to 39,870.96, 55,021.79 and 21,965.81

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Solution

The fourth proportional to 39,870.96, 55,021.79 and 21,965.81 is: 30,312.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,870.96 : 55,021.79 = 21,965.81 : x
  2. Step 2: Convert to fraction form
    39,870.96/55,021.79 = 21,965.81/x
  3. Step 3: Cross multiply
    39,870.96x = 55,021.79 × 21,965.81
  4. Step 4: Simplify right side
    39,870.96x = 1,208,597,800.06
  5. Step 5: Solve for x
    x = 1,208,597,800.06/39,870.96
  6. Step 6: Final answer
    x = 30,312.74

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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.