Home / 8,171.20-12,256.80-7,458.40

Finding the Fourth Proportional to 8,171.20, 12,256.80 and 7,458.40

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Solution

The fourth proportional to 8,171.20, 12,256.80 and 7,458.40 is: 11,187.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,171.20 : 12,256.80 = 7,458.40 : x
  2. Step 2: Convert to fraction form
    8,171.20/12,256.80 = 7,458.40/x
  3. Step 3: Cross multiply
    8,171.20x = 12,256.80 × 7,458.40
  4. Step 4: Simplify right side
    8,171.20x = 91,416,117.12
  5. Step 5: Solve for x
    x = 91,416,117.12/8,171.20
  6. Step 6: Final answer
    x = 11,187.60

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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.