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Finding the Fourth Proportional to 680,504.70, 939,185.91 and 390,229.86

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Solution

The fourth proportional to 680,504.70, 939,185.91 and 390,229.86 is: 538,568.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,504.70 : 939,185.91 = 390,229.86 : x
  2. Step 2: Convert to fraction form
    680,504.70/939,185.91 = 390,229.86/x
  3. Step 3: Cross multiply
    680,504.70x = 939,185.91 × 390,229.86
  4. Step 4: Simplify right side
    680,504.70x = 366,498,386,173.27
  5. Step 5: Solve for x
    x = 366,498,386,173.27/680,504.70
  6. Step 6: Final answer
    x = 538,568.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.