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Finding the Fourth Proportional to 392,990.40, 589,485.60 and 143,769.60

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Solution

The fourth proportional to 392,990.40, 589,485.60 and 143,769.60 is: 215,654.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,990.40 : 589,485.60 = 143,769.60 : x
  2. Step 2: Convert to fraction form
    392,990.40/589,485.60 = 143,769.60/x
  3. Step 3: Cross multiply
    392,990.40x = 589,485.60 × 143,769.60
  4. Step 4: Simplify right side
    392,990.40x = 84,750,108,917.76
  5. Step 5: Solve for x
    x = 84,750,108,917.76/392,990.40
  6. Step 6: Final answer
    x = 215,654.40

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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.