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Finding the Fourth Proportional to 391,190.40, 586,785.60 and 213,600.53

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Solution

The fourth proportional to 391,190.40, 586,785.60 and 213,600.53 is: 320,400.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,190.40 : 586,785.60 = 213,600.53 : x
  2. Step 2: Convert to fraction form
    391,190.40/586,785.60 = 213,600.53/x
  3. Step 3: Cross multiply
    391,190.40x = 586,785.60 × 213,600.53
  4. Step 4: Simplify right side
    391,190.40x = 125,337,716,623.33
  5. Step 5: Solve for x
    x = 125,337,716,623.33/391,190.40
  6. Step 6: Final answer
    x = 320,400.80

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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.