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Finding the Fourth Proportional to 38,810, 53,557.80 and 21,146

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Solution

The fourth proportional to 38,810, 53,557.80 and 21,146 is: 29,181.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,810 : 53,557.80 = 21,146 : x
  2. Step 2: Convert to fraction form
    38,810/53,557.80 = 21,146/x
  3. Step 3: Cross multiply
    38,810x = 53,557.80 × 21,146
  4. Step 4: Simplify right side
    38,810x = 1,132,533,238.80
  5. Step 5: Solve for x
    x = 1,132,533,238.80/38,810
  6. Step 6: Final answer
    x = 29,181.48

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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.