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Finding the Fourth Proportional to 20,669.76, 30,989.76 and 10,135.68

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Solution

The fourth proportional to 20,669.76, 30,989.76 and 10,135.68 is: 15,196.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.76 : 30,989.76 = 10,135.68 : x
  2. Step 2: Convert to fraction form
    20,669.76/30,989.76 = 10,135.68/x
  3. Step 3: Cross multiply
    20,669.76x = 30,989.76 × 10,135.68
  4. Step 4: Simplify right side
    20,669.76x = 314,102,290.64
  5. Step 5: Solve for x
    x = 314,102,290.64/20,669.76
  6. Step 6: Final answer
    x = 15,196.22

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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.