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Finding the Fourth Proportional to 129,990.90, 194,767.65 and 122,117.70

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Solution

The fourth proportional to 129,990.90, 194,767.65 and 122,117.70 is: 182,971.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,990.90 : 194,767.65 = 122,117.70 : x
  2. Step 2: Convert to fraction form
    129,990.90/194,767.65 = 122,117.70/x
  3. Step 3: Cross multiply
    129,990.90x = 194,767.65 × 122,117.70
  4. Step 4: Simplify right side
    129,990.90x = 23,784,577,452.41
  5. Step 5: Solve for x
    x = 23,784,577,452.41/129,990.90
  6. Step 6: Final answer
    x = 182,971.10

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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.