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Finding the Fourth Proportional to 486,420.40, 729,630.60 and 131,489.20

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Solution

The fourth proportional to 486,420.40, 729,630.60 and 131,489.20 is: 197,233.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,420.40 : 729,630.60 = 131,489.20 : x
  2. Step 2: Convert to fraction form
    486,420.40/729,630.60 = 131,489.20/x
  3. Step 3: Cross multiply
    486,420.40x = 729,630.60 × 131,489.20
  4. Step 4: Simplify right side
    486,420.40x = 95,938,543,889.52
  5. Step 5: Solve for x
    x = 95,938,543,889.52/486,420.40
  6. Step 6: Final answer
    x = 197,233.80

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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.