Home / 20,640.62-28,485.06-11,688.50

Finding the Fourth Proportional to 20,640.62, 28,485.06 and 11,688.50

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Solution

The fourth proportional to 20,640.62, 28,485.06 and 11,688.50 is: 16,130.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.62 : 28,485.06 = 11,688.50 : x
  2. Step 2: Convert to fraction form
    20,640.62/28,485.06 = 11,688.50/x
  3. Step 3: Cross multiply
    20,640.62x = 28,485.06 × 11,688.50
  4. Step 4: Simplify right side
    20,640.62x = 332,947,623.81
  5. Step 5: Solve for x
    x = 332,947,623.81/20,640.62
  6. Step 6: Final answer
    x = 16,130.70

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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.