Home / 12,656.40-18,984.60-8,719.80

Finding the Fourth Proportional to 12,656.40, 18,984.60 and 8,719.80

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Solution

The fourth proportional to 12,656.40, 18,984.60 and 8,719.80 is: 13,079.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,656.40 : 18,984.60 = 8,719.80 : x
  2. Step 2: Convert to fraction form
    12,656.40/18,984.60 = 8,719.80/x
  3. Step 3: Cross multiply
    12,656.40x = 18,984.60 × 8,719.80
  4. Step 4: Simplify right side
    12,656.40x = 165,541,915.08
  5. Step 5: Solve for x
    x = 165,541,915.08/12,656.40
  6. Step 6: Final answer
    x = 13,079.70

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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.