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Finding the Fourth Proportional to 386,720.40, 579,389.40 and 331,424.40

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Solution

The fourth proportional to 386,720.40, 579,389.40 and 331,424.40 is: 496,544.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,720.40 : 579,389.40 = 331,424.40 : x
  2. Step 2: Convert to fraction form
    386,720.40/579,389.40 = 331,424.40/x
  3. Step 3: Cross multiply
    386,720.40x = 579,389.40 × 331,424.40
  4. Step 4: Simplify right side
    386,720.40x = 192,023,784,261.36
  5. Step 5: Solve for x
    x = 192,023,784,261.36/386,720.40
  6. Step 6: Final answer
    x = 496,544.23

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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.