Home / 8,142.61-12,205.66-3,215.72

Finding the Fourth Proportional to 8,142.61, 12,205.66 and 3,215.72

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Solution

The fourth proportional to 8,142.61, 12,205.66 and 3,215.72 is: 4,820.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,142.61 : 12,205.66 = 3,215.72 : x
  2. Step 2: Convert to fraction form
    8,142.61/12,205.66 = 3,215.72/x
  3. Step 3: Cross multiply
    8,142.61x = 12,205.66 × 3,215.72
  4. Step 4: Simplify right side
    8,142.61x = 39,249,984.98
  5. Step 5: Solve for x
    x = 39,249,984.98/8,142.61
  6. Step 6: Final answer
    x = 4,820.32

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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.