Home / 28,355.70-39,081.42-20,785.95

Finding the Fourth Proportional to 28,355.70, 39,081.42 and 20,785.95

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Solution

The fourth proportional to 28,355.70, 39,081.42 and 20,785.95 is: 28,648.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.70 : 39,081.42 = 20,785.95 : x
  2. Step 2: Convert to fraction form
    28,355.70/39,081.42 = 20,785.95/x
  3. Step 3: Cross multiply
    28,355.70x = 39,081.42 × 20,785.95
  4. Step 4: Simplify right side
    28,355.70x = 812,344,442.05
  5. Step 5: Solve for x
    x = 812,344,442.05/28,355.70
  6. Step 6: Final answer
    x = 28,648.36

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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.