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Finding the Fourth Proportional to 426,989.56, 640,461.24 and 216,622.03

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Solution

The fourth proportional to 426,989.56, 640,461.24 and 216,622.03 is: 324,921.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,989.56 : 640,461.24 = 216,622.03 : x
  2. Step 2: Convert to fraction form
    426,989.56/640,461.24 = 216,622.03/x
  3. Step 3: Cross multiply
    426,989.56x = 640,461.24 × 216,622.03
  4. Step 4: Simplify right side
    426,989.56x = 138,738,013,945.12
  5. Step 5: Solve for x
    x = 138,738,013,945.12/426,989.56
  6. Step 6: Final answer
    x = 324,921.33

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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.