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Finding the Fourth Proportional to 38,803, 53,548.14 and 21,139

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Solution

The fourth proportional to 38,803, 53,548.14 and 21,139 is: 29,171.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,803 : 53,548.14 = 21,139 : x
  2. Step 2: Convert to fraction form
    38,803/53,548.14 = 21,139/x
  3. Step 3: Cross multiply
    38,803x = 53,548.14 × 21,139
  4. Step 4: Simplify right side
    38,803x = 1,131,954,131.46
  5. Step 5: Solve for x
    x = 1,131,954,131.46/38,803
  6. Step 6: Final answer
    x = 29,171.82

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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.