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Finding the Fourth Proportional to 643,407.80, 965,111.70 and 394,575.80

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Solution

The fourth proportional to 643,407.80, 965,111.70 and 394,575.80 is: 591,863.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,407.80 : 965,111.70 = 394,575.80 : x
  2. Step 2: Convert to fraction form
    643,407.80/965,111.70 = 394,575.80/x
  3. Step 3: Cross multiply
    643,407.80x = 965,111.70 × 394,575.80
  4. Step 4: Simplify right side
    643,407.80x = 380,809,721,116.86
  5. Step 5: Solve for x
    x = 380,809,721,116.86/643,407.80
  6. Step 6: Final answer
    x = 591,863.70

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.