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Finding the Fourth Proportional to 85,910.56, 128,760.08 and 40,955.60

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Solution

The fourth proportional to 85,910.56, 128,760.08 and 40,955.60 is: 61,382.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.56 : 128,760.08 = 40,955.60 : x
  2. Step 2: Convert to fraction form
    85,910.56/128,760.08 = 40,955.60/x
  3. Step 3: Cross multiply
    85,910.56x = 128,760.08 × 40,955.60
  4. Step 4: Simplify right side
    85,910.56x = 5,273,446,332.45
  5. Step 5: Solve for x
    x = 5,273,446,332.45/85,910.56
  6. Step 6: Final answer
    x = 61,382.98

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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.