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Finding the Fourth Proportional to 391,999.60, 587,999.40 and 111,480.40

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Solution

The fourth proportional to 391,999.60, 587,999.40 and 111,480.40 is: 167,220.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,999.60 : 587,999.40 = 111,480.40 : x
  2. Step 2: Convert to fraction form
    391,999.60/587,999.40 = 111,480.40/x
  3. Step 3: Cross multiply
    391,999.60x = 587,999.40 × 111,480.40
  4. Step 4: Simplify right side
    391,999.60x = 65,550,408,311.76
  5. Step 5: Solve for x
    x = 65,550,408,311.76/391,999.60
  6. Step 6: Final answer
    x = 167,220.60

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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.