Home / 20,803.75-28,702.89-12,306.85

Finding the Fourth Proportional to 20,803.75, 28,702.89 and 12,306.85

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Solution

The fourth proportional to 20,803.75, 28,702.89 and 12,306.85 is: 16,979.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.75 : 28,702.89 = 12,306.85 : x
  2. Step 2: Convert to fraction form
    20,803.75/28,702.89 = 12,306.85/x
  3. Step 3: Cross multiply
    20,803.75x = 28,702.89 × 12,306.85
  4. Step 4: Simplify right side
    20,803.75x = 353,242,090.04
  5. Step 5: Solve for x
    x = 353,242,090.04/20,803.75
  6. Step 6: Final answer
    x = 16,979.73

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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.