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Finding the Fourth Proportional to 390,069.70, 585,104.55 and 323,584.90

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Solution

The fourth proportional to 390,069.70, 585,104.55 and 323,584.90 is: 485,377.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,069.70 : 585,104.55 = 323,584.90 : x
  2. Step 2: Convert to fraction form
    390,069.70/585,104.55 = 323,584.90/x
  3. Step 3: Cross multiply
    390,069.70x = 585,104.55 × 323,584.90
  4. Step 4: Simplify right side
    390,069.70x = 189,330,997,301.30
  5. Step 5: Solve for x
    x = 189,330,997,301.30/390,069.70
  6. Step 6: Final answer
    x = 485,377.35

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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.