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Finding the Fourth Proportional to 355,090.60, 531,339.90 and 261,778.60

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Solution

The fourth proportional to 355,090.60, 531,339.90 and 261,778.60 is: 391,712.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,090.60 : 531,339.90 = 261,778.60 : x
  2. Step 2: Convert to fraction form
    355,090.60/531,339.90 = 261,778.60/x
  3. Step 3: Cross multiply
    355,090.60x = 531,339.90 × 261,778.60
  4. Step 4: Simplify right side
    355,090.60x = 139,093,415,146.14
  5. Step 5: Solve for x
    x = 139,093,415,146.14/355,090.60
  6. Step 6: Final answer
    x = 391,712.47

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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.