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Finding the Fourth Proportional to 640,517, 883,914.90 and 385,878.92

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Solution

The fourth proportional to 640,517, 883,914.90 and 385,878.92 is: 532,513.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,517 : 883,914.90 = 385,878.92 : x
  2. Step 2: Convert to fraction form
    640,517/883,914.90 = 385,878.92/x
  3. Step 3: Cross multiply
    640,517x = 883,914.90 × 385,878.92
  4. Step 4: Simplify right side
    640,517x = 341,084,126,983.91
  5. Step 5: Solve for x
    x = 341,084,126,983.91/640,517
  6. Step 6: Final answer
    x = 532,513.78

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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.