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Finding the Fourth Proportional to 390,059.70, 585,089.55 and 331,010.70

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Solution

The fourth proportional to 390,059.70, 585,089.55 and 331,010.70 is: 496,516.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,059.70 : 585,089.55 = 331,010.70 : x
  2. Step 2: Convert to fraction form
    390,059.70/585,089.55 = 331,010.70/x
  3. Step 3: Cross multiply
    390,059.70x = 585,089.55 × 331,010.70
  4. Step 4: Simplify right side
    390,059.70x = 193,670,901,508.19
  5. Step 5: Solve for x
    x = 193,670,901,508.19/390,059.70
  6. Step 6: Final answer
    x = 496,516.05

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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.