Home / 80,585.10-120,877.50-21,420.77

Finding the Fourth Proportional to 80,585.10, 120,877.50 and 21,420.77

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Solution

The fourth proportional to 80,585.10, 120,877.50 and 21,420.77 is: 32,131.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,585.10 : 120,877.50 = 21,420.77 : x
  2. Step 2: Convert to fraction form
    80,585.10/120,877.50 = 21,420.77/x
  3. Step 3: Cross multiply
    80,585.10x = 120,877.50 × 21,420.77
  4. Step 4: Simplify right side
    80,585.10x = 2,589,288,601.62
  5. Step 5: Solve for x
    x = 2,589,288,601.62/80,585.10
  6. Step 6: Final answer
    x = 32,131.11

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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.