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Finding the Fourth Proportional to 657,940.60, 986,910.90 and 421,744.60

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Solution

The fourth proportional to 657,940.60, 986,910.90 and 421,744.60 is: 632,616.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,940.60 : 986,910.90 = 421,744.60 : x
  2. Step 2: Convert to fraction form
    657,940.60/986,910.90 = 421,744.60/x
  3. Step 3: Cross multiply
    657,940.60x = 986,910.90 × 421,744.60
  4. Step 4: Simplify right side
    657,940.60x = 416,224,342,756.14
  5. Step 5: Solve for x
    x = 416,224,342,756.14/657,940.60
  6. Step 6: Final answer
    x = 632,616.90

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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.