Home / 20,640.48-28,485.12-11,688.88

Finding the Fourth Proportional to 20,640.48, 28,485.12 and 11,688.88

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Solution

The fourth proportional to 20,640.48, 28,485.12 and 11,688.88 is: 16,131.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.48 : 28,485.12 = 11,688.88 : x
  2. Step 2: Convert to fraction form
    20,640.48/28,485.12 = 11,688.88/x
  3. Step 3: Cross multiply
    20,640.48x = 28,485.12 × 11,688.88
  4. Step 4: Simplify right side
    20,640.48x = 332,959,149.47
  5. Step 5: Solve for x
    x = 332,959,149.47/20,640.48
  6. Step 6: Final answer
    x = 16,131.37

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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.