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Finding the Fourth Proportional to 404,287.80, 606,485.70 and 137,981.40

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Solution

The fourth proportional to 404,287.80, 606,485.70 and 137,981.40 is: 206,990.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    404,287.80 : 606,485.70 = 137,981.40 : x
  2. Step 2: Convert to fraction form
    404,287.80/606,485.70 = 137,981.40/x
  3. Step 3: Cross multiply
    404,287.80x = 606,485.70 × 137,981.40
  4. Step 4: Simplify right side
    404,287.80x = 83,683,745,965.98
  5. Step 5: Solve for x
    x = 83,683,745,965.98/404,287.80
  6. Step 6: Final answer
    x = 206,990.53

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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.