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Finding the Fourth Proportional to 394,474.80, 591,712.20 and 145,124.40

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Solution

The fourth proportional to 394,474.80, 591,712.20 and 145,124.40 is: 217,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,474.80 : 591,712.20 = 145,124.40 : x
  2. Step 2: Convert to fraction form
    394,474.80/591,712.20 = 145,124.40/x
  3. Step 3: Cross multiply
    394,474.80x = 591,712.20 × 145,124.40
  4. Step 4: Simplify right side
    394,474.80x = 85,871,877,997.68
  5. Step 5: Solve for x
    x = 85,871,877,997.68/394,474.80
  6. Step 6: Final answer
    x = 217,686.60

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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.