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Finding the Fourth Proportional to 123,276.60, 184,987.80 and 81,278.10

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Solution

The fourth proportional to 123,276.60, 184,987.80 and 81,278.10 is: 121,965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,276.60 : 184,987.80 = 81,278.10 : x
  2. Step 2: Convert to fraction form
    123,276.60/184,987.80 = 81,278.10/x
  3. Step 3: Cross multiply
    123,276.60x = 184,987.80 × 81,278.10
  4. Step 4: Simplify right side
    123,276.60x = 15,035,456,907.18
  5. Step 5: Solve for x
    x = 15,035,456,907.18/123,276.60
  6. Step 6: Final answer
    x = 121,965.21

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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.