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Finding the Fourth Proportional to 501,172.01, 690,948.29 and 398,148.05

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Solution

The fourth proportional to 501,172.01, 690,948.29 and 398,148.05 is: 548,912.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    501,172.01 : 690,948.29 = 398,148.05 : x
  2. Step 2: Convert to fraction form
    501,172.01/690,948.29 = 398,148.05/x
  3. Step 3: Cross multiply
    501,172.01x = 690,948.29 × 398,148.05
  4. Step 4: Simplify right side
    501,172.01x = 275,099,711,854.96
  5. Step 5: Solve for x
    x = 275,099,711,854.96/501,172.01
  6. Step 6: Final answer
    x = 548,912.76

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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.