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Finding the Fourth Proportional to 465,772.80, 698,659.20 and 128,812.80

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Solution

The fourth proportional to 465,772.80, 698,659.20 and 128,812.80 is: 193,219.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    465,772.80 : 698,659.20 = 128,812.80 : x
  2. Step 2: Convert to fraction form
    465,772.80/698,659.20 = 128,812.80/x
  3. Step 3: Cross multiply
    465,772.80x = 698,659.20 × 128,812.80
  4. Step 4: Simplify right side
    465,772.80x = 89,996,247,797.76
  5. Step 5: Solve for x
    x = 89,996,247,797.76/465,772.80
  6. Step 6: Final answer
    x = 193,219.20

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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.