Home / 80,421.86-120,633.82-21,257.01

Finding the Fourth Proportional to 80,421.86, 120,633.82 and 21,257.01

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Solution

The fourth proportional to 80,421.86, 120,633.82 and 21,257.01 is: 31,885.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,421.86 : 120,633.82 = 21,257.01 : x
  2. Step 2: Convert to fraction form
    80,421.86/120,633.82 = 21,257.01/x
  3. Step 3: Cross multiply
    80,421.86x = 120,633.82 × 21,257.01
  4. Step 4: Simplify right side
    80,421.86x = 2,564,314,264.94
  5. Step 5: Solve for x
    x = 2,564,314,264.94/80,421.86
  6. Step 6: Final answer
    x = 31,885.79

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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.