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Finding the Fourth Proportional to 54,486.90, 81,714.15 and 21,187.80

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Solution

The fourth proportional to 54,486.90, 81,714.15 and 21,187.80 is: 31,775.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,486.90 : 81,714.15 = 21,187.80 : x
  2. Step 2: Convert to fraction form
    54,486.90/81,714.15 = 21,187.80/x
  3. Step 3: Cross multiply
    54,486.90x = 81,714.15 × 21,187.80
  4. Step 4: Simplify right side
    54,486.90x = 1,731,343,067.37
  5. Step 5: Solve for x
    x = 1,731,343,067.37/54,486.90
  6. Step 6: Final answer
    x = 31,775.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.