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Finding the Fourth Proportional to 129,680.80, 194,521.20 and 82,986.40

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Solution

The fourth proportional to 129,680.80, 194,521.20 and 82,986.40 is: 124,479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,680.80 : 194,521.20 = 82,986.40 : x
  2. Step 2: Convert to fraction form
    129,680.80/194,521.20 = 82,986.40/x
  3. Step 3: Cross multiply
    129,680.80x = 194,521.20 × 82,986.40
  4. Step 4: Simplify right side
    129,680.80x = 16,142,614,111.68
  5. Step 5: Solve for x
    x = 16,142,614,111.68/129,680.80
  6. Step 6: Final answer
    x = 124,479.60

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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.