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Finding the Fourth Proportional to 640,781.39, 884,242.98 and 354,282.57

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Solution

The fourth proportional to 640,781.39, 884,242.98 and 354,282.57 is: 488,890.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,781.39 : 884,242.98 = 354,282.57 : x
  2. Step 2: Convert to fraction form
    640,781.39/884,242.98 = 354,282.57/x
  3. Step 3: Cross multiply
    640,781.39x = 884,242.98 × 354,282.57
  4. Step 4: Simplify right side
    640,781.39x = 313,271,875,458.86
  5. Step 5: Solve for x
    x = 313,271,875,458.86/640,781.39
  6. Step 6: Final answer
    x = 488,890.41

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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.