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Finding the Fourth Proportional to 206,874.70, 310,312.05 and 128,142.70

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Solution

The fourth proportional to 206,874.70, 310,312.05 and 128,142.70 is: 192,214.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,874.70 : 310,312.05 = 128,142.70 : x
  2. Step 2: Convert to fraction form
    206,874.70/310,312.05 = 128,142.70/x
  3. Step 3: Cross multiply
    206,874.70x = 310,312.05 × 128,142.70
  4. Step 4: Simplify right side
    206,874.70x = 39,764,223,929.54
  5. Step 5: Solve for x
    x = 39,764,223,929.54/206,874.70
  6. Step 6: Final answer
    x = 192,214.05

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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.