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Finding the Fourth Proportional to 640,930.80, 961,396.20 and 401,782.35

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Solution

The fourth proportional to 640,930.80, 961,396.20 and 401,782.35 is: 602,673.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,930.80 : 961,396.20 = 401,782.35 : x
  2. Step 2: Convert to fraction form
    640,930.80/961,396.20 = 401,782.35/x
  3. Step 3: Cross multiply
    640,930.80x = 961,396.20 × 401,782.35
  4. Step 4: Simplify right side
    640,930.80x = 386,272,024,517.07
  5. Step 5: Solve for x
    x = 386,272,024,517.07/640,930.80
  6. Step 6: Final answer
    x = 602,673.53

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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.