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Finding the Fourth Proportional to 417,940.80, 626,911.20 and 207,988.80

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Solution

The fourth proportional to 417,940.80, 626,911.20 and 207,988.80 is: 311,983.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    417,940.80 : 626,911.20 = 207,988.80 : x
  2. Step 2: Convert to fraction form
    417,940.80/626,911.20 = 207,988.80/x
  3. Step 3: Cross multiply
    417,940.80x = 626,911.20 × 207,988.80
  4. Step 4: Simplify right side
    417,940.80x = 130,390,508,194.56
  5. Step 5: Solve for x
    x = 130,390,508,194.56/417,940.80
  6. Step 6: Final answer
    x = 311,983.20

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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.