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Finding the Fourth Proportional to 640,939.80, 961,409.70 and 401,791.35

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Solution

The fourth proportional to 640,939.80, 961,409.70 and 401,791.35 is: 602,687.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,939.80 : 961,409.70 = 401,791.35 : x
  2. Step 2: Convert to fraction form
    640,939.80/961,409.70 = 401,791.35/x
  3. Step 3: Cross multiply
    640,939.80x = 961,409.70 × 401,791.35
  4. Step 4: Simplify right side
    640,939.80x = 386,286,101,266.10
  5. Step 5: Solve for x
    x = 386,286,101,266.10/640,939.80
  6. Step 6: Final answer
    x = 602,687.03

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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.