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Finding the Fourth Proportional to 129,876.40, 194,668.80 and 66,672.10

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Solution

The fourth proportional to 129,876.40, 194,668.80 and 66,672.10 is: 99,933.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,876.40 : 194,668.80 = 66,672.10 : x
  2. Step 2: Convert to fraction form
    129,876.40/194,668.80 = 66,672.10/x
  3. Step 3: Cross multiply
    129,876.40x = 194,668.80 × 66,672.10
  4. Step 4: Simplify right side
    129,876.40x = 12,978,977,700.48
  5. Step 5: Solve for x
    x = 12,978,977,700.48/129,876.40
  6. Step 6: Final answer
    x = 99,933.30

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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.