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Finding the Fourth Proportional to 445,416.40, 668,124.60 and 129,905.20

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Solution

The fourth proportional to 445,416.40, 668,124.60 and 129,905.20 is: 194,857.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,416.40 : 668,124.60 = 129,905.20 : x
  2. Step 2: Convert to fraction form
    445,416.40/668,124.60 = 129,905.20/x
  3. Step 3: Cross multiply
    445,416.40x = 668,124.60 × 129,905.20
  4. Step 4: Simplify right side
    445,416.40x = 86,792,859,787.92
  5. Step 5: Solve for x
    x = 86,792,859,787.92/445,416.40
  6. Step 6: Final answer
    x = 194,857.80

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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.