Home / 20,870.80-28,803.26-12,917.65

Finding the Fourth Proportional to 20,870.80, 28,803.26 and 12,917.65

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Solution

The fourth proportional to 20,870.80, 28,803.26 and 12,917.65 is: 17,827.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.80 : 28,803.26 = 12,917.65 : x
  2. Step 2: Convert to fraction form
    20,870.80/28,803.26 = 12,917.65/x
  3. Step 3: Cross multiply
    20,870.80x = 28,803.26 × 12,917.65
  4. Step 4: Simplify right side
    20,870.80x = 372,070,431.54
  5. Step 5: Solve for x
    x = 372,070,431.54/20,870.80
  6. Step 6: Final answer
    x = 17,827.32

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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.