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Finding the Fourth Proportional to 677,405.96, 934,812.48 and 390,919.88

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Solution

The fourth proportional to 677,405.96, 934,812.48 and 390,919.88 is: 539,464.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,405.96 : 934,812.48 = 390,919.88 : x
  2. Step 2: Convert to fraction form
    677,405.96/934,812.48 = 390,919.88/x
  3. Step 3: Cross multiply
    677,405.96x = 934,812.48 × 390,919.88
  4. Step 4: Simplify right side
    677,405.96x = 365,436,782,504.10
  5. Step 5: Solve for x
    x = 365,436,782,504.10/677,405.96
  6. Step 6: Final answer
    x = 539,464.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.