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Finding the Fourth Proportional to 400,912.31, 553,259.21 and 219,630.80

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Solution

The fourth proportional to 400,912.31, 553,259.21 and 219,630.80 is: 303,090.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,912.31 : 553,259.21 = 219,630.80 : x
  2. Step 2: Convert to fraction form
    400,912.31/553,259.21 = 219,630.80/x
  3. Step 3: Cross multiply
    400,912.31x = 553,259.21 × 219,630.80
  4. Step 4: Simplify right side
    400,912.31x = 121,512,762,899.67
  5. Step 5: Solve for x
    x = 121,512,762,899.67/400,912.31
  6. Step 6: Final answer
    x = 303,090.63

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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.