Home / 20,815.42-28,716.57-13,647.06

Finding the Fourth Proportional to 20,815.42, 28,716.57 and 13,647.06

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Solution

The fourth proportional to 20,815.42, 28,716.57 and 13,647.06 is: 18,827.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.42 : 28,716.57 = 13,647.06 : x
  2. Step 2: Convert to fraction form
    20,815.42/28,716.57 = 13,647.06/x
  3. Step 3: Cross multiply
    20,815.42x = 28,716.57 × 13,647.06
  4. Step 4: Simplify right side
    20,815.42x = 391,896,753.78
  5. Step 5: Solve for x
    x = 391,896,753.78/20,815.42
  6. Step 6: Final answer
    x = 18,827.23

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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.