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Finding the Fourth Proportional to 391,458.02, 587,412.81 and 211,543.85

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Solution

The fourth proportional to 391,458.02, 587,412.81 and 211,543.85 is: 317,437.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,458.02 : 587,412.81 = 211,543.85 : x
  2. Step 2: Convert to fraction form
    391,458.02/587,412.81 = 211,543.85/x
  3. Step 3: Cross multiply
    391,458.02x = 587,412.81 × 211,543.85
  4. Step 4: Simplify right side
    391,458.02x = 124,263,568,835.25
  5. Step 5: Solve for x
    x = 124,263,568,835.25/391,458.02
  6. Step 6: Final answer
    x = 317,437.79

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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.