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Finding the Fourth Proportional to 85,840.30, 128,760.45 and 73,155.70

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Solution

The fourth proportional to 85,840.30, 128,760.45 and 73,155.70 is: 109,733.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,840.30 : 128,760.45 = 73,155.70 : x
  2. Step 2: Convert to fraction form
    85,840.30/128,760.45 = 73,155.70/x
  3. Step 3: Cross multiply
    85,840.30x = 128,760.45 × 73,155.70
  4. Step 4: Simplify right side
    85,840.30x = 9,419,560,852.07
  5. Step 5: Solve for x
    x = 9,419,560,852.07/85,840.30
  6. Step 6: Final answer
    x = 109,733.55

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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.