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Finding the Fourth Proportional to 85,840.70, 128,469.45 and 75,343.10

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Solution

The fourth proportional to 85,840.70, 128,469.45 and 75,343.10 is: 112,758.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,840.70 : 128,469.45 = 75,343.10 : x
  2. Step 2: Convert to fraction form
    85,840.70/128,469.45 = 75,343.10/x
  3. Step 3: Cross multiply
    85,840.70x = 128,469.45 × 75,343.10
  4. Step 4: Simplify right side
    85,840.70x = 9,679,286,618.30
  5. Step 5: Solve for x
    x = 9,679,286,618.30/85,840.70
  6. Step 6: Final answer
    x = 112,758.71

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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.