Home / 39,890.45-55,049.47-21,985.20

Finding the Fourth Proportional to 39,890.45, 55,049.47 and 21,985.20

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Solution

The fourth proportional to 39,890.45, 55,049.47 and 21,985.20 is: 30,339.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.45 : 55,049.47 = 21,985.20 : x
  2. Step 2: Convert to fraction form
    39,890.45/55,049.47 = 21,985.20/x
  3. Step 3: Cross multiply
    39,890.45x = 55,049.47 × 21,985.20
  4. Step 4: Simplify right side
    39,890.45x = 1,210,273,552.88
  5. Step 5: Solve for x
    x = 1,210,273,552.88/39,890.45
  6. Step 6: Final answer
    x = 30,339.93

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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.