Home / 25,780.20-38,612.70-19,890.60

Finding the Fourth Proportional to 25,780.20, 38,612.70 and 19,890.60

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Solution

The fourth proportional to 25,780.20, 38,612.70 and 19,890.60 is: 29,791.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,780.20 : 38,612.70 = 19,890.60 : x
  2. Step 2: Convert to fraction form
    25,780.20/38,612.70 = 19,890.60/x
  3. Step 3: Cross multiply
    25,780.20x = 38,612.70 × 19,890.60
  4. Step 4: Simplify right side
    25,780.20x = 768,029,770.62
  5. Step 5: Solve for x
    x = 768,029,770.62/25,780.20
  6. Step 6: Final answer
    x = 29,791.46

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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.