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Finding the Fourth Proportional to 640,854.20, 959,969.10 and 325,488.80

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Solution

The fourth proportional to 640,854.20, 959,969.10 and 325,488.80 is: 487,566.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,854.20 : 959,969.10 = 325,488.80 : x
  2. Step 2: Convert to fraction form
    640,854.20/959,969.10 = 325,488.80/x
  3. Step 3: Cross multiply
    640,854.20x = 959,969.10 × 325,488.80
  4. Step 4: Simplify right side
    640,854.20x = 312,459,190,396.08
  5. Step 5: Solve for x
    x = 312,459,190,396.08/640,854.20
  6. Step 6: Final answer
    x = 487,566.74

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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.