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Finding the Fourth Proportional to 391,999.80, 587,999.70 and 259,289.40

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Solution

The fourth proportional to 391,999.80, 587,999.70 and 259,289.40 is: 388,934.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,999.80 : 587,999.70 = 259,289.40 : x
  2. Step 2: Convert to fraction form
    391,999.80/587,999.70 = 259,289.40/x
  3. Step 3: Cross multiply
    391,999.80x = 587,999.70 × 259,289.40
  4. Step 4: Simplify right side
    391,999.80x = 152,462,089,413.18
  5. Step 5: Solve for x
    x = 152,462,089,413.18/391,999.80
  6. Step 6: Final answer
    x = 388,934.10

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1.5x scale

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.