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Finding the Fourth Proportional to 691,781.88, 954,702.90 and 389,995.32

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Solution

The fourth proportional to 691,781.88, 954,702.90 and 389,995.32 is: 538,218.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,781.88 : 954,702.90 = 389,995.32 : x
  2. Step 2: Convert to fraction form
    691,781.88/954,702.90 = 389,995.32/x
  3. Step 3: Cross multiply
    691,781.88x = 954,702.90 × 389,995.32
  4. Step 4: Simplify right side
    691,781.88x = 372,329,662,990.43
  5. Step 5: Solve for x
    x = 372,329,662,990.43/691,781.88
  6. Step 6: Final answer
    x = 538,218.29

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Double scale
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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.