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Finding the Fourth Proportional to 123,310.40, 184,965.60 and 85,985.60

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Solution

The fourth proportional to 123,310.40, 184,965.60 and 85,985.60 is: 128,978.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,310.40 : 184,965.60 = 85,985.60 : x
  2. Step 2: Convert to fraction form
    123,310.40/184,965.60 = 85,985.60/x
  3. Step 3: Cross multiply
    123,310.40x = 184,965.60 × 85,985.60
  4. Step 4: Simplify right side
    123,310.40x = 15,904,378,095.36
  5. Step 5: Solve for x
    x = 15,904,378,095.36/123,310.40
  6. Step 6: Final answer
    x = 128,978.40

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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.