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Finding the Fourth Proportional to 38,979, 53,796.29 and 21,986.73

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Solution

The fourth proportional to 38,979, 53,796.29 and 21,986.73 is: 30,344.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,979 : 53,796.29 = 21,986.73 : x
  2. Step 2: Convert to fraction form
    38,979/53,796.29 = 21,986.73/x
  3. Step 3: Cross multiply
    38,979x = 53,796.29 × 21,986.73
  4. Step 4: Simplify right side
    38,979x = 1,182,804,393.30
  5. Step 5: Solve for x
    x = 1,182,804,393.30/38,979
  6. Step 6: Final answer
    x = 30,344.66

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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.