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Finding the Fourth Proportional to 8,123.64, 12,177.72 and 3,191.64

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Solution

The fourth proportional to 8,123.64, 12,177.72 and 3,191.64 is: 4,784.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,123.64 : 12,177.72 = 3,191.64 : x
  2. Step 2: Convert to fraction form
    8,123.64/12,177.72 = 3,191.64/x
  3. Step 3: Cross multiply
    8,123.64x = 12,177.72 × 3,191.64
  4. Step 4: Simplify right side
    8,123.64x = 38,866,898.26
  5. Step 5: Solve for x
    x = 38,866,898.26/8,123.64
  6. Step 6: Final answer
    x = 4,784.42

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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.