Home / 21,273.31-31,878.57-18,937.77

Finding the Fourth Proportional to 21,273.31, 31,878.57 and 18,937.77

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Solution

The fourth proportional to 21,273.31, 31,878.57 and 18,937.77 is: 28,378.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,273.31 : 31,878.57 = 18,937.77 : x
  2. Step 2: Convert to fraction form
    21,273.31/31,878.57 = 18,937.77/x
  3. Step 3: Cross multiply
    21,273.31x = 31,878.57 × 18,937.77
  4. Step 4: Simplify right side
    21,273.31x = 603,709,026.59
  5. Step 5: Solve for x
    x = 603,709,026.59/21,273.31
  6. Step 6: Final answer
    x = 28,378.71

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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.