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Finding the Fourth Proportional to 38,991.52, 53,808.74 and 21,086.88

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Solution

The fourth proportional to 38,991.52, 53,808.74 and 21,086.88 is: 29,100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,991.52 : 53,808.74 = 21,086.88 : x
  2. Step 2: Convert to fraction form
    38,991.52/53,808.74 = 21,086.88/x
  3. Step 3: Cross multiply
    38,991.52x = 53,808.74 × 21,086.88
  4. Step 4: Simplify right side
    38,991.52x = 1,134,658,443.33
  5. Step 5: Solve for x
    x = 1,134,658,443.33/38,991.52
  6. Step 6: Final answer
    x = 29,100.13

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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.