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Finding the Fourth Proportional to 639,946.40, 959,660.40 and 219,005.60

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Solution

The fourth proportional to 639,946.40, 959,660.40 and 219,005.60 is: 328,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,946.40 : 959,660.40 = 219,005.60 : x
  2. Step 2: Convert to fraction form
    639,946.40/959,660.40 = 219,005.60/x
  3. Step 3: Cross multiply
    639,946.40x = 959,660.40 × 219,005.60
  4. Step 4: Simplify right side
    639,946.40x = 210,171,001,698.24
  5. Step 5: Solve for x
    x = 210,171,001,698.24/639,946.40
  6. Step 6: Final answer
    x = 328,419.70

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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.