Home / 8,155.20-12,232.80-7,438.40

Finding the Fourth Proportional to 8,155.20, 12,232.80 and 7,438.40

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Solution

The fourth proportional to 8,155.20, 12,232.80 and 7,438.40 is: 11,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,155.20 : 12,232.80 = 7,438.40 : x
  2. Step 2: Convert to fraction form
    8,155.20/12,232.80 = 7,438.40/x
  3. Step 3: Cross multiply
    8,155.20x = 12,232.80 × 7,438.40
  4. Step 4: Simplify right side
    8,155.20x = 90,992,459.52
  5. Step 5: Solve for x
    x = 90,992,459.52/8,155.20
  6. Step 6: Final answer
    x = 11,157.60

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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.