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Finding the Fourth Proportional to 137,211.80, 205,817.70 and 128,917.40

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Solution

The fourth proportional to 137,211.80, 205,817.70 and 128,917.40 is: 193,376.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,211.80 : 205,817.70 = 128,917.40 : x
  2. Step 2: Convert to fraction form
    137,211.80/205,817.70 = 128,917.40/x
  3. Step 3: Cross multiply
    137,211.80x = 205,817.70 × 128,917.40
  4. Step 4: Simplify right side
    137,211.80x = 26,533,482,757.98
  5. Step 5: Solve for x
    x = 26,533,482,757.98/137,211.80
  6. Step 6: Final answer
    x = 193,376.10

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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.