Home / 20,640.08-28,483.65-11,687.36

Finding the Fourth Proportional to 20,640.08, 28,483.65 and 11,687.36

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Solution

The fourth proportional to 20,640.08, 28,483.65 and 11,687.36 is: 16,128.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.08 : 28,483.65 = 11,687.36 : x
  2. Step 2: Convert to fraction form
    20,640.08/28,483.65 = 11,687.36/x
  3. Step 3: Cross multiply
    20,640.08x = 28,483.65 × 11,687.36
  4. Step 4: Simplify right side
    20,640.08x = 332,898,529.25
  5. Step 5: Solve for x
    x = 332,898,529.25/20,640.08
  6. Step 6: Final answer
    x = 16,128.74

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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.