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Finding the Fourth Proportional to 129,780.90, 194,707.80 and 54,936.90

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Solution

The fourth proportional to 129,780.90, 194,707.80 and 54,936.90 is: 82,420.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,780.90 : 194,707.80 = 54,936.90 : x
  2. Step 2: Convert to fraction form
    129,780.90/194,707.80 = 54,936.90/x
  3. Step 3: Cross multiply
    129,780.90x = 194,707.80 × 54,936.90
  4. Step 4: Simplify right side
    129,780.90x = 10,696,642,937.82
  5. Step 5: Solve for x
    x = 10,696,642,937.82/129,780.90
  6. Step 6: Final answer
    x = 82,420.78

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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.