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Finding the Fourth Proportional to 391,431.40, 587,147.10 and 329,223.40

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Solution

The fourth proportional to 391,431.40, 587,147.10 and 329,223.40 is: 493,835.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,431.40 : 587,147.10 = 329,223.40 : x
  2. Step 2: Convert to fraction form
    391,431.40/587,147.10 = 329,223.40/x
  3. Step 3: Cross multiply
    391,431.40x = 587,147.10 × 329,223.40
  4. Step 4: Simplify right side
    391,431.40x = 193,302,564,562.14
  5. Step 5: Solve for x
    x = 193,302,564,562.14/391,431.40
  6. Step 6: Final answer
    x = 493,835.10

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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.