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Finding the Fourth Proportional to 129,920.40, 194,746.20 and 70,630.80

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Solution

The fourth proportional to 129,920.40, 194,746.20 and 70,630.80 is: 105,873.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,920.40 : 194,746.20 = 70,630.80 : x
  2. Step 2: Convert to fraction form
    129,920.40/194,746.20 = 70,630.80/x
  3. Step 3: Cross multiply
    129,920.40x = 194,746.20 × 70,630.80
  4. Step 4: Simplify right side
    129,920.40x = 13,755,079,902.96
  5. Step 5: Solve for x
    x = 13,755,079,902.96/129,920.40
  6. Step 6: Final answer
    x = 105,873.13

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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.