Home / 28,415.80-42,623.70-15,731.20

Finding the Fourth Proportional to 28,415.80, 42,623.70 and 15,731.20

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Solution

The fourth proportional to 28,415.80, 42,623.70 and 15,731.20 is: 23,596.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.80 : 42,623.70 = 15,731.20 : x
  2. Step 2: Convert to fraction form
    28,415.80/42,623.70 = 15,731.20/x
  3. Step 3: Cross multiply
    28,415.80x = 42,623.70 × 15,731.20
  4. Step 4: Simplify right side
    28,415.80x = 670,521,949.44
  5. Step 5: Solve for x
    x = 670,521,949.44/28,415.80
  6. Step 6: Final answer
    x = 23,596.80

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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.