Home / 28,156.21-42,288.99-20,731.35

Finding the Fourth Proportional to 28,156.21, 42,288.99 and 20,731.35

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Solution

The fourth proportional to 28,156.21, 42,288.99 and 20,731.35 is: 31,137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,156.21 : 42,288.99 = 20,731.35 : x
  2. Step 2: Convert to fraction form
    28,156.21/42,288.99 = 20,731.35/x
  3. Step 3: Cross multiply
    28,156.21x = 42,288.99 × 20,731.35
  4. Step 4: Simplify right side
    28,156.21x = 876,707,852.84
  5. Step 5: Solve for x
    x = 876,707,852.84/28,156.21
  6. Step 6: Final answer
    x = 31,137.28

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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.