Home / 20,780.85-28,640.49-15,732.99

Finding the Fourth Proportional to 20,780.85, 28,640.49 and 15,732.99

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Solution

The fourth proportional to 20,780.85, 28,640.49 and 15,732.99 is: 21,683.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.85 : 28,640.49 = 15,732.99 : x
  2. Step 2: Convert to fraction form
    20,780.85/28,640.49 = 15,732.99/x
  3. Step 3: Cross multiply
    20,780.85x = 28,640.49 × 15,732.99
  4. Step 4: Simplify right side
    20,780.85x = 450,600,542.77
  5. Step 5: Solve for x
    x = 450,600,542.77/20,780.85
  6. Step 6: Final answer
    x = 21,683.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.