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Finding the Fourth Proportional to 403,913.80, 605,870.70 and 137,974.60

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Solution

The fourth proportional to 403,913.80, 605,870.70 and 137,974.60 is: 206,961.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,913.80 : 605,870.70 = 137,974.60 : x
  2. Step 2: Convert to fraction form
    403,913.80/605,870.70 = 137,974.60/x
  3. Step 3: Cross multiply
    403,913.80x = 605,870.70 × 137,974.60
  4. Step 4: Simplify right side
    403,913.80x = 83,594,767,484.22
  5. Step 5: Solve for x
    x = 83,594,767,484.22/403,913.80
  6. Step 6: Final answer
    x = 206,961.90

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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.