Home / 8,220.72-12,339.40-7,289.64

Finding the Fourth Proportional to 8,220.72, 12,339.40 and 7,289.64

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Solution

The fourth proportional to 8,220.72, 12,339.40 and 7,289.64 is: 10,941.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,220.72 : 12,339.40 = 7,289.64 : x
  2. Step 2: Convert to fraction form
    8,220.72/12,339.40 = 7,289.64/x
  3. Step 3: Cross multiply
    8,220.72x = 12,339.40 × 7,289.64
  4. Step 4: Simplify right side
    8,220.72x = 89,949,783.82
  5. Step 5: Solve for x
    x = 89,949,783.82/8,220.72
  6. Step 6: Final answer
    x = 10,941.84

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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.