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Finding the Fourth Proportional to 403,419.80, 605,129.70 and 137,480.60

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Solution

The fourth proportional to 403,419.80, 605,129.70 and 137,480.60 is: 206,220.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,419.80 : 605,129.70 = 137,480.60 : x
  2. Step 2: Convert to fraction form
    403,419.80/605,129.70 = 137,480.60/x
  3. Step 3: Cross multiply
    403,419.80x = 605,129.70 × 137,480.60
  4. Step 4: Simplify right side
    403,419.80x = 83,193,594,233.82
  5. Step 5: Solve for x
    x = 83,193,594,233.82/403,419.80
  6. Step 6: Final answer
    x = 206,220.90

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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.