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Finding the Fourth Proportional to 386,330.40, 578,183.40 and 339,091.20

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Solution

The fourth proportional to 386,330.40, 578,183.40 and 339,091.20 is: 507,485.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,330.40 : 578,183.40 = 339,091.20 : x
  2. Step 2: Convert to fraction form
    386,330.40/578,183.40 = 339,091.20/x
  3. Step 3: Cross multiply
    386,330.40x = 578,183.40 × 339,091.20
  4. Step 4: Simplify right side
    386,330.40x = 196,056,902,926.08
  5. Step 5: Solve for x
    x = 196,056,902,926.08/386,330.40
  6. Step 6: Final answer
    x = 507,485.05

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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.