Home / 20,030.40-30,030.48-12,131.28

Finding the Fourth Proportional to 20,030.40, 30,030.48 and 12,131.28

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Solution

The fourth proportional to 20,030.40, 30,030.48 and 12,131.28 is: 18,187.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,030.40 : 30,030.48 = 12,131.28 : x
  2. Step 2: Convert to fraction form
    20,030.40/30,030.48 = 12,131.28/x
  3. Step 3: Cross multiply
    20,030.40x = 30,030.48 × 12,131.28
  4. Step 4: Simplify right side
    20,030.40x = 364,308,161.41
  5. Step 5: Solve for x
    x = 364,308,161.41/20,030.40
  6. Step 6: Final answer
    x = 18,187.76

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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.