Home / 28,638.62-42,936.32-18,780.38

Finding the Fourth Proportional to 28,638.62, 42,936.32 and 18,780.38

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Solution

The fourth proportional to 28,638.62, 42,936.32 and 18,780.38 is: 28,156.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.62 : 42,936.32 = 18,780.38 : x
  2. Step 2: Convert to fraction form
    28,638.62/42,936.32 = 18,780.38/x
  3. Step 3: Cross multiply
    28,638.62x = 42,936.32 × 18,780.38
  4. Step 4: Simplify right side
    28,638.62x = 806,360,405.40
  5. Step 5: Solve for x
    x = 806,360,405.40/28,638.62
  6. Step 6: Final answer
    x = 28,156.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.