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Finding the Fourth Proportional to 640,565.87, 883,986.17 and 354,090.74

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Solution

The fourth proportional to 640,565.87, 883,986.17 and 354,090.74 is: 488,648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,565.87 : 883,986.17 = 354,090.74 : x
  2. Step 2: Convert to fraction form
    640,565.87/883,986.17 = 354,090.74/x
  3. Step 3: Cross multiply
    640,565.87x = 883,986.17 × 354,090.74
  4. Step 4: Simplify right side
    640,565.87x = 313,011,310,894.68
  5. Step 5: Solve for x
    x = 313,011,310,894.68/640,565.87
  6. Step 6: Final answer
    x = 488,648.13

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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.