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Finding the Fourth Proportional to 80,874.90, 121,308.21 and 30,978.90

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Solution

The fourth proportional to 80,874.90, 121,308.21 and 30,978.90 is: 46,466.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,874.90 : 121,308.21 = 30,978.90 : x
  2. Step 2: Convert to fraction form
    80,874.90/121,308.21 = 30,978.90/x
  3. Step 3: Cross multiply
    80,874.90x = 121,308.21 × 30,978.90
  4. Step 4: Simplify right side
    80,874.90x = 3,757,994,906.77
  5. Step 5: Solve for x
    x = 3,757,994,906.77/80,874.90
  6. Step 6: Final answer
    x = 46,466.76

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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.