Home / 20,640.90-28,489.55-11,693.68

Finding the Fourth Proportional to 20,640.90, 28,489.55 and 11,693.68

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Solution

The fourth proportional to 20,640.90, 28,489.55 and 11,693.68 is: 16,140.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.90 : 28,489.55 = 11,693.68 : x
  2. Step 2: Convert to fraction form
    20,640.90/28,489.55 = 11,693.68/x
  3. Step 3: Cross multiply
    20,640.90x = 28,489.55 × 11,693.68
  4. Step 4: Simplify right side
    20,640.90x = 333,147,681.04
  5. Step 5: Solve for x
    x = 333,147,681.04/20,640.90
  6. Step 6: Final answer
    x = 16,140.17

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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.