Home / 20,459.60-30,707.40-12,129.20

Finding the Fourth Proportional to 20,459.60, 30,707.40 and 12,129.20

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Solution

The fourth proportional to 20,459.60, 30,707.40 and 12,129.20 is: 18,204.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.60 : 30,707.40 = 12,129.20 : x
  2. Step 2: Convert to fraction form
    20,459.60/30,707.40 = 12,129.20/x
  3. Step 3: Cross multiply
    20,459.60x = 30,707.40 × 12,129.20
  4. Step 4: Simplify right side
    20,459.60x = 372,456,196.08
  5. Step 5: Solve for x
    x = 372,456,196.08/20,459.60
  6. Step 6: Final answer
    x = 18,204.47

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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.