Home / 28,212.49-38,920.71-18,139.06

Finding the Fourth Proportional to 28,212.49, 38,920.71 and 18,139.06

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Solution

The fourth proportional to 28,212.49, 38,920.71 and 18,139.06 is: 25,023.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.49 : 38,920.71 = 18,139.06 : x
  2. Step 2: Convert to fraction form
    28,212.49/38,920.71 = 18,139.06/x
  3. Step 3: Cross multiply
    28,212.49x = 38,920.71 × 18,139.06
  4. Step 4: Simplify right side
    28,212.49x = 705,985,093.93
  5. Step 5: Solve for x
    x = 705,985,093.93/28,212.49
  6. Step 6: Final answer
    x = 25,023.85

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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.