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Finding the Fourth Proportional to 665,087.20, 997,630.80 and 398,710.60

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Solution

The fourth proportional to 665,087.20, 997,630.80 and 398,710.60 is: 598,065.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,087.20 : 997,630.80 = 398,710.60 : x
  2. Step 2: Convert to fraction form
    665,087.20/997,630.80 = 398,710.60/x
  3. Step 3: Cross multiply
    665,087.20x = 997,630.80 × 398,710.60
  4. Step 4: Simplify right side
    665,087.20x = 397,765,974,846.48
  5. Step 5: Solve for x
    x = 397,765,974,846.48/665,087.20
  6. Step 6: Final answer
    x = 598,065.90

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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.