Home / 8,135.20-12,202.80-7,422.40

Finding the Fourth Proportional to 8,135.20, 12,202.80 and 7,422.40

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Solution

The fourth proportional to 8,135.20, 12,202.80 and 7,422.40 is: 11,133.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,135.20 : 12,202.80 = 7,422.40 : x
  2. Step 2: Convert to fraction form
    8,135.20/12,202.80 = 7,422.40/x
  3. Step 3: Cross multiply
    8,135.20x = 12,202.80 × 7,422.40
  4. Step 4: Simplify right side
    8,135.20x = 90,574,062.72
  5. Step 5: Solve for x
    x = 90,574,062.72/8,135.20
  6. Step 6: Final answer
    x = 11,133.60

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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.