Home / 20,802.78-28,697.76-13,629.54

Finding the Fourth Proportional to 20,802.78, 28,697.76 and 13,629.54

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Solution

The fourth proportional to 20,802.78, 28,697.76 and 13,629.54 is: 18,802.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,802.78 : 28,697.76 = 13,629.54 : x
  2. Step 2: Convert to fraction form
    20,802.78/28,697.76 = 13,629.54/x
  3. Step 3: Cross multiply
    20,802.78x = 28,697.76 × 13,629.54
  4. Step 4: Simplify right side
    20,802.78x = 391,137,267.83
  5. Step 5: Solve for x
    x = 391,137,267.83/20,802.78
  6. Step 6: Final answer
    x = 18,802.16

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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.