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Finding the Fourth Proportional to 390,728.72, 585,662.52 and 255,630.44

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Solution

The fourth proportional to 390,728.72, 585,662.52 and 255,630.44 is: 383,163.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,728.72 : 585,662.52 = 255,630.44 : x
  2. Step 2: Convert to fraction form
    390,728.72/585,662.52 = 255,630.44/x
  3. Step 3: Cross multiply
    390,728.72x = 585,662.52 × 255,630.44
  4. Step 4: Simplify right side
    390,728.72x = 149,713,167,679.11
  5. Step 5: Solve for x
    x = 149,713,167,679.11/390,728.72
  6. Step 6: Final answer
    x = 383,163.97

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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.