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Finding the Fourth Proportional to 561,943.20, 842,914.80 and 321,810.60

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Solution

The fourth proportional to 561,943.20, 842,914.80 and 321,810.60 is: 482,715.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,943.20 : 842,914.80 = 321,810.60 : x
  2. Step 2: Convert to fraction form
    561,943.20/842,914.80 = 321,810.60/x
  3. Step 3: Cross multiply
    561,943.20x = 842,914.80 × 321,810.60
  4. Step 4: Simplify right side
    561,943.20x = 271,258,917,536.88
  5. Step 5: Solve for x
    x = 271,258,917,536.88/561,943.20
  6. Step 6: Final answer
    x = 482,715.90

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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.