Home / 20,661.30-28,517.18-13,588.38

Finding the Fourth Proportional to 20,661.30, 28,517.18 and 13,588.38

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Solution

The fourth proportional to 20,661.30, 28,517.18 and 13,588.38 is: 18,754.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.30 : 28,517.18 = 13,588.38 : x
  2. Step 2: Convert to fraction form
    20,661.30/28,517.18 = 13,588.38/x
  3. Step 3: Cross multiply
    20,661.30x = 28,517.18 × 13,588.38
  4. Step 4: Simplify right side
    20,661.30x = 387,502,210.43
  5. Step 5: Solve for x
    x = 387,502,210.43/20,661.30
  6. Step 6: Final answer
    x = 18,754.98

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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.