Home / 20,758.88-28,640.12-12,585.12

Finding the Fourth Proportional to 20,758.88, 28,640.12 and 12,585.12

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Solution

The fourth proportional to 20,758.88, 28,640.12 and 12,585.12 is: 17,363.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,758.88 : 28,640.12 = 12,585.12 : x
  2. Step 2: Convert to fraction form
    20,758.88/28,640.12 = 12,585.12/x
  3. Step 3: Cross multiply
    20,758.88x = 28,640.12 × 12,585.12
  4. Step 4: Simplify right side
    20,758.88x = 360,439,284.09
  5. Step 5: Solve for x
    x = 360,439,284.09/20,758.88
  6. Step 6: Final answer
    x = 17,363.14

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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.