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Finding the Fourth Proportional to 640,872.90, 960,272.55 and 403,791.30

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Solution

The fourth proportional to 640,872.90, 960,272.55 and 403,791.30 is: 605,033.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,872.90 : 960,272.55 = 403,791.30 : x
  2. Step 2: Convert to fraction form
    640,872.90/960,272.55 = 403,791.30/x
  3. Step 3: Cross multiply
    640,872.90x = 960,272.55 × 403,791.30
  4. Step 4: Simplify right side
    640,872.90x = 387,749,701,318.82
  5. Step 5: Solve for x
    x = 387,749,701,318.82/640,872.90
  6. Step 6: Final answer
    x = 605,033.70

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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.