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Finding the Fourth Proportional to 28,536.73, 39,418.31 and 21,904.31

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Solution

The fourth proportional to 28,536.73, 39,418.31 and 21,904.31 is: 30,256.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,536.73 : 39,418.31 = 21,904.31 : x
  2. Step 2: Convert to fraction form
    28,536.73/39,418.31 = 21,904.31/x
  3. Step 3: Cross multiply
    28,536.73x = 39,418.31 × 21,904.31
  4. Step 4: Simplify right side
    28,536.73x = 863,430,575.30
  5. Step 5: Solve for x
    x = 863,430,575.30/28,536.73
  6. Step 6: Final answer
    x = 30,256.82

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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.