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Finding the Fourth Proportional to 390,296.95, 585,046.63 and 221,460.62

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Solution

The fourth proportional to 390,296.95, 585,046.63 and 221,460.62 is: 331,964.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,296.95 : 585,046.63 = 221,460.62 : x
  2. Step 2: Convert to fraction form
    390,296.95/585,046.63 = 221,460.62/x
  3. Step 3: Cross multiply
    390,296.95x = 585,046.63 × 221,460.62
  4. Step 4: Simplify right side
    390,296.95x = 129,564,786,760.30
  5. Step 5: Solve for x
    x = 129,564,786,760.30/390,296.95
  6. Step 6: Final answer
    x = 331,964.64

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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.