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Finding the Fourth Proportional to 391,426.40, 587,139.60 and 329,218.40

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Solution

The fourth proportional to 391,426.40, 587,139.60 and 329,218.40 is: 493,827.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,426.40 : 587,139.60 = 329,218.40 : x
  2. Step 2: Convert to fraction form
    391,426.40/587,139.60 = 329,218.40/x
  3. Step 3: Cross multiply
    391,426.40x = 587,139.60 × 329,218.40
  4. Step 4: Simplify right side
    391,426.40x = 193,297,159,688.64
  5. Step 5: Solve for x
    x = 193,297,159,688.64/391,426.40
  6. Step 6: Final answer
    x = 493,827.60

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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.