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Finding the Fourth Proportional to 391,355.20, 585,477.60 and 339,342.40

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Solution

The fourth proportional to 391,355.20, 585,477.60 and 339,342.40 is: 507,665.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,355.20 : 585,477.60 = 339,342.40 : x
  2. Step 2: Convert to fraction form
    391,355.20/585,477.60 = 339,342.40/x
  3. Step 3: Cross multiply
    391,355.20x = 585,477.60 × 339,342.40
  4. Step 4: Simplify right side
    391,355.20x = 198,677,373,930.24
  5. Step 5: Solve for x
    x = 198,677,373,930.24/391,355.20
  6. Step 6: Final answer
    x = 507,665.09

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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.