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Finding the Fourth Proportional to 640,686.12, 884,067.66 and 354,211.80

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Solution

The fourth proportional to 640,686.12, 884,067.66 and 354,211.80 is: 488,768.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,686.12 : 884,067.66 = 354,211.80 : x
  2. Step 2: Convert to fraction form
    640,686.12/884,067.66 = 354,211.80/x
  3. Step 3: Cross multiply
    640,686.12x = 884,067.66 × 354,211.80
  4. Step 4: Simplify right side
    640,686.12x = 313,147,197,170.39
  5. Step 5: Solve for x
    x = 313,147,197,170.39/640,686.12
  6. Step 6: Final answer
    x = 488,768.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.