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Finding the Fourth Proportional to 642,677.20, 964,015.80 and 327,749.20

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Solution

The fourth proportional to 642,677.20, 964,015.80 and 327,749.20 is: 491,623.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,677.20 : 964,015.80 = 327,749.20 : x
  2. Step 2: Convert to fraction form
    642,677.20/964,015.80 = 327,749.20/x
  3. Step 3: Cross multiply
    642,677.20x = 964,015.80 × 327,749.20
  4. Step 4: Simplify right side
    642,677.20x = 315,955,407,237.36
  5. Step 5: Solve for x
    x = 315,955,407,237.36/642,677.20
  6. Step 6: Final answer
    x = 491,623.80

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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.