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Finding the Fourth Proportional to 85,758.36, 128,631.33 and 28,832.64

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Solution

The fourth proportional to 85,758.36, 128,631.33 and 28,832.64 is: 43,246.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,758.36 : 128,631.33 = 28,832.64 : x
  2. Step 2: Convert to fraction form
    85,758.36/128,631.33 = 28,832.64/x
  3. Step 3: Cross multiply
    85,758.36x = 128,631.33 × 28,832.64
  4. Step 4: Simplify right side
    85,758.36x = 3,708,780,830.61
  5. Step 5: Solve for x
    x = 3,708,780,830.61/85,758.36
  6. Step 6: Final answer
    x = 43,246.87

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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.