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Finding the Fourth Proportional to 71,380.40, 106,840.20 and 65,850.80

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Solution

The fourth proportional to 71,380.40, 106,840.20 and 65,850.80 is: 98,563.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,380.40 : 106,840.20 = 65,850.80 : x
  2. Step 2: Convert to fraction form
    71,380.40/106,840.20 = 65,850.80/x
  3. Step 3: Cross multiply
    71,380.40x = 106,840.20 × 65,850.80
  4. Step 4: Simplify right side
    71,380.40x = 7,035,512,642.16
  5. Step 5: Solve for x
    x = 7,035,512,642.16/71,380.40
  6. Step 6: Final answer
    x = 98,563.65

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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.