Home / 81,021.22-121,543.98-28,421.44

Finding the Fourth Proportional to 81,021.22, 121,543.98 and 28,421.44

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Solution

The fourth proportional to 81,021.22, 121,543.98 and 28,421.44 is: 42,636.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.22 : 121,543.98 = 28,421.44 : x
  2. Step 2: Convert to fraction form
    81,021.22/121,543.98 = 28,421.44/x
  3. Step 3: Cross multiply
    81,021.22x = 121,543.98 × 28,421.44
  4. Step 4: Simplify right side
    81,021.22x = 3,454,454,327.21
  5. Step 5: Solve for x
    x = 3,454,454,327.21/81,021.22
  6. Step 6: Final answer
    x = 42,636.42

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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.