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Finding the Fourth Proportional to 391,291.36, 587,021.18 and 121,413.89

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Solution

The fourth proportional to 391,291.36, 587,021.18 and 121,413.89 is: 182,146.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,291.36 : 587,021.18 = 121,413.89 : x
  2. Step 2: Convert to fraction form
    391,291.36/587,021.18 = 121,413.89/x
  3. Step 3: Cross multiply
    391,291.36x = 587,021.18 × 121,413.89
  4. Step 4: Simplify right side
    391,291.36x = 71,272,522,534.68
  5. Step 5: Solve for x
    x = 71,272,522,534.68/391,291.36
  6. Step 6: Final answer
    x = 182,146.94

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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.