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Finding the Fourth Proportional to 258,439.61, 387,659.42 and 80,947.25

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Solution

The fourth proportional to 258,439.61, 387,659.42 and 80,947.25 is: 121,420.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,439.61 : 387,659.42 = 80,947.25 : x
  2. Step 2: Convert to fraction form
    258,439.61/387,659.42 = 80,947.25/x
  3. Step 3: Cross multiply
    258,439.61x = 387,659.42 × 80,947.25
  4. Step 4: Simplify right side
    258,439.61x = 31,379,963,399.84
  5. Step 5: Solve for x
    x = 31,379,963,399.84/258,439.61
  6. Step 6: Final answer
    x = 121,420.87

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1.5x scale

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.