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Finding the Fourth Proportional to 129,478.40, 194,217.60 and 76,860.80

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Solution

The fourth proportional to 129,478.40, 194,217.60 and 76,860.80 is: 115,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,478.40 : 194,217.60 = 76,860.80 : x
  2. Step 2: Convert to fraction form
    129,478.40/194,217.60 = 76,860.80/x
  3. Step 3: Cross multiply
    129,478.40x = 194,217.60 × 76,860.80
  4. Step 4: Simplify right side
    129,478.40x = 14,927,720,110.08
  5. Step 5: Solve for x
    x = 14,927,720,110.08/129,478.40
  6. Step 6: Final answer
    x = 115,291.20

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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.