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Finding the Fourth Proportional to 640,418.40, 959,590.80 and 403,336.80

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Solution

The fourth proportional to 640,418.40, 959,590.80 and 403,336.80 is: 604,352.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,418.40 : 959,590.80 = 403,336.80 : x
  2. Step 2: Convert to fraction form
    640,418.40/959,590.80 = 403,336.80/x
  3. Step 3: Cross multiply
    640,418.40x = 959,590.80 × 403,336.80
  4. Step 4: Simplify right side
    640,418.40x = 387,038,282,581.44
  5. Step 5: Solve for x
    x = 387,038,282,581.44/640,418.40
  6. Step 6: Final answer
    x = 604,352.22

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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.