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Finding the Fourth Proportional to 85,874.04, 128,889.64 and 43,784.30

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Solution

The fourth proportional to 85,874.04, 128,889.64 and 43,784.30 is: 65,716.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,874.04 : 128,889.64 = 43,784.30 : x
  2. Step 2: Convert to fraction form
    85,874.04/128,889.64 = 43,784.30/x
  3. Step 3: Cross multiply
    85,874.04x = 128,889.64 × 43,784.30
  4. Step 4: Simplify right side
    85,874.04x = 5,643,342,664.65
  5. Step 5: Solve for x
    x = 5,643,342,664.65/85,874.04
  6. Step 6: Final answer
    x = 65,716.52

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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.