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Finding the Fourth Proportional to 84,268.90, 126,403.35 and 21,939.40

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Solution

The fourth proportional to 84,268.90, 126,403.35 and 21,939.40 is: 32,909.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,268.90 : 126,403.35 = 21,939.40 : x
  2. Step 2: Convert to fraction form
    84,268.90/126,403.35 = 21,939.40/x
  3. Step 3: Cross multiply
    84,268.90x = 126,403.35 × 21,939.40
  4. Step 4: Simplify right side
    84,268.90x = 2,773,213,656.99
  5. Step 5: Solve for x
    x = 2,773,213,656.99/84,268.90
  6. Step 6: Final answer
    x = 32,909.10

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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.