Home / 20,038.78-30,002.64-10,129.60

Finding the Fourth Proportional to 20,038.78, 30,002.64 and 10,129.60

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Solution

The fourth proportional to 20,038.78, 30,002.64 and 10,129.60 is: 15,166.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,038.78 : 30,002.64 = 10,129.60 : x
  2. Step 2: Convert to fraction form
    20,038.78/30,002.64 = 10,129.60/x
  3. Step 3: Cross multiply
    20,038.78x = 30,002.64 × 10,129.60
  4. Step 4: Simplify right side
    20,038.78x = 303,914,742.14
  5. Step 5: Solve for x
    x = 303,914,742.14/20,038.78
  6. Step 6: Final answer
    x = 15,166.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.