Home / 8,679.40-12,999.66-5,209.48

Finding the Fourth Proportional to 8,679.40, 12,999.66 and 5,209.48

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Solution

The fourth proportional to 8,679.40, 12,999.66 and 5,209.48 is: 7,802.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.40 : 12,999.66 = 5,209.48 : x
  2. Step 2: Convert to fraction form
    8,679.40/12,999.66 = 5,209.48/x
  3. Step 3: Cross multiply
    8,679.40x = 12,999.66 × 5,209.48
  4. Step 4: Simplify right side
    8,679.40x = 67,721,468.78
  5. Step 5: Solve for x
    x = 67,721,468.78/8,679.40
  6. Step 6: Final answer
    x = 7,802.55

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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.