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Finding the Fourth Proportional to 640,004.80, 959,132.40 and 426,164.80

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Solution

The fourth proportional to 640,004.80, 959,132.40 and 426,164.80 is: 638,664.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,004.80 : 959,132.40 = 426,164.80 : x
  2. Step 2: Convert to fraction form
    640,004.80/959,132.40 = 426,164.80/x
  3. Step 3: Cross multiply
    640,004.80x = 959,132.40 × 426,164.80
  4. Step 4: Simplify right side
    640,004.80x = 408,748,467,419.52
  5. Step 5: Solve for x
    x = 408,748,467,419.52/640,004.80
  6. Step 6: Final answer
    x = 638,664.69

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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.