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Finding the Fourth Proportional to 85,485.40, 128,381.70 and 82,720.60

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Solution

The fourth proportional to 85,485.40, 128,381.70 and 82,720.60 is: 124,229.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,485.40 : 128,381.70 = 82,720.60 : x
  2. Step 2: Convert to fraction form
    85,485.40/128,381.70 = 82,720.60/x
  3. Step 3: Cross multiply
    85,485.40x = 128,381.70 × 82,720.60
  4. Step 4: Simplify right side
    85,485.40x = 10,619,811,253.02
  5. Step 5: Solve for x
    x = 10,619,811,253.02/85,485.40
  6. Step 6: Final answer
    x = 124,229.53

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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.