Home / 21,241.85-31,819.02-12,455.57

Finding the Fourth Proportional to 21,241.85, 31,819.02 and 12,455.57

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Solution

The fourth proportional to 21,241.85, 31,819.02 and 12,455.57 is: 18,657.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,241.85 : 31,819.02 = 12,455.57 : x
  2. Step 2: Convert to fraction form
    21,241.85/31,819.02 = 12,455.57/x
  3. Step 3: Cross multiply
    21,241.85x = 31,819.02 × 12,455.57
  4. Step 4: Simplify right side
    21,241.85x = 396,324,030.94
  5. Step 5: Solve for x
    x = 396,324,030.94/21,241.85
  6. Step 6: Final answer
    x = 18,657.70

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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.