Home / 20,782.15-28,678.18-12,285.06

Finding the Fourth Proportional to 20,782.15, 28,678.18 and 12,285.06

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Solution

The fourth proportional to 20,782.15, 28,678.18 and 12,285.06 is: 16,952.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.15 : 28,678.18 = 12,285.06 : x
  2. Step 2: Convert to fraction form
    20,782.15/28,678.18 = 12,285.06/x
  3. Step 3: Cross multiply
    20,782.15x = 28,678.18 × 12,285.06
  4. Step 4: Simplify right side
    20,782.15x = 352,313,023.73
  5. Step 5: Solve for x
    x = 352,313,023.73/20,782.15
  6. Step 6: Final answer
    x = 16,952.68

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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.