Home / 13,430.40-20,145.60-8,239.20

Finding the Fourth Proportional to 13,430.40, 20,145.60 and 8,239.20

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Solution

The fourth proportional to 13,430.40, 20,145.60 and 8,239.20 is: 12,358.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,430.40 : 20,145.60 = 8,239.20 : x
  2. Step 2: Convert to fraction form
    13,430.40/20,145.60 = 8,239.20/x
  3. Step 3: Cross multiply
    13,430.40x = 20,145.60 × 8,239.20
  4. Step 4: Simplify right side
    13,430.40x = 165,983,627.52
  5. Step 5: Solve for x
    x = 165,983,627.52/13,430.40
  6. Step 6: Final answer
    x = 12,358.80

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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.