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Finding the Fourth Proportional to 38,925, 53,717.78 and 21,261

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Solution

The fourth proportional to 38,925, 53,717.78 and 21,261 is: 29,340.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,925 : 53,717.78 = 21,261 : x
  2. Step 2: Convert to fraction form
    38,925/53,717.78 = 21,261/x
  3. Step 3: Cross multiply
    38,925x = 53,717.78 × 21,261
  4. Step 4: Simplify right side
    38,925x = 1,142,093,720.58
  5. Step 5: Solve for x
    x = 1,142,093,720.58/38,925
  6. Step 6: Final answer
    x = 29,340.88

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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.