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Finding the Fourth Proportional to 501,166.76, 690,941.05 and 398,142.78

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Solution

The fourth proportional to 501,166.76, 690,941.05 and 398,142.78 is: 548,905.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    501,166.76 : 690,941.05 = 398,142.78 : x
  2. Step 2: Convert to fraction form
    501,166.76/690,941.05 = 398,142.78/x
  3. Step 3: Cross multiply
    501,166.76x = 690,941.05 × 398,142.78
  4. Step 4: Simplify right side
    501,166.76x = 275,093,190,463.12
  5. Step 5: Solve for x
    x = 275,093,190,463.12/501,166.76
  6. Step 6: Final answer
    x = 548,905.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.