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Finding the Fourth Proportional to 391,090.60, 539,712.69 and 255,211.48

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Solution

The fourth proportional to 391,090.60, 539,712.69 and 255,211.48 is: 352,196.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,090.60 : 539,712.69 = 255,211.48 : x
  2. Step 2: Convert to fraction form
    391,090.60/539,712.69 = 255,211.48/x
  3. Step 3: Cross multiply
    391,090.60x = 539,712.69 × 255,211.48
  4. Step 4: Simplify right side
    391,090.60x = 137,740,874,389.68
  5. Step 5: Solve for x
    x = 137,740,874,389.68/391,090.60
  6. Step 6: Final answer
    x = 352,196.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.