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Finding the Fourth Proportional to 407,643.20, 611,551.20 and 123,310.40

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Solution

The fourth proportional to 407,643.20, 611,551.20 and 123,310.40 is: 184,991.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,643.20 : 611,551.20 = 123,310.40 : x
  2. Step 2: Convert to fraction form
    407,643.20/611,551.20 = 123,310.40/x
  3. Step 3: Cross multiply
    407,643.20x = 611,551.20 × 123,310.40
  4. Step 4: Simplify right side
    407,643.20x = 75,410,623,092.48
  5. Step 5: Solve for x
    x = 75,410,623,092.48/407,643.20
  6. Step 6: Final answer
    x = 184,991.74

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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.