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Finding the Fourth Proportional to 390,216.60, 585,324.90 and 203,203.80

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Solution

The fourth proportional to 390,216.60, 585,324.90 and 203,203.80 is: 304,805.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,216.60 : 585,324.90 = 203,203.80 : x
  2. Step 2: Convert to fraction form
    390,216.60/585,324.90 = 203,203.80/x
  3. Step 3: Cross multiply
    390,216.60x = 585,324.90 × 203,203.80
  4. Step 4: Simplify right side
    390,216.60x = 118,940,243,914.62
  5. Step 5: Solve for x
    x = 118,940,243,914.62/390,216.60
  6. Step 6: Final answer
    x = 304,805.70

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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.