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Finding the Fourth Proportional to 390,064.20, 584,440.20 and 333,639.60

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Solution

The fourth proportional to 390,064.20, 584,440.20 and 333,639.60 is: 499,898.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,064.20 : 584,440.20 = 333,639.60 : x
  2. Step 2: Convert to fraction form
    390,064.20/584,440.20 = 333,639.60/x
  3. Step 3: Cross multiply
    390,064.20x = 584,440.20 × 333,639.60
  4. Step 4: Simplify right side
    390,064.20x = 194,992,394,551.92
  5. Step 5: Solve for x
    x = 194,992,394,551.92/390,064.20
  6. Step 6: Final answer
    x = 499,898.21

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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.