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Finding the Fourth Proportional to 386,401.20, 579,601.80 and 279,956.40

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Solution

The fourth proportional to 386,401.20, 579,601.80 and 279,956.40 is: 419,934.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,401.20 : 579,601.80 = 279,956.40 : x
  2. Step 2: Convert to fraction form
    386,401.20/579,601.80 = 279,956.40/x
  3. Step 3: Cross multiply
    386,401.20x = 579,601.80 × 279,956.40
  4. Step 4: Simplify right side
    386,401.20x = 162,263,233,361.52
  5. Step 5: Solve for x
    x = 162,263,233,361.52/386,401.20
  6. Step 6: Final answer
    x = 419,934.60

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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.