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Finding the Fourth Proportional to 351,638.34, 485,904.60 and 255,978.96

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Solution

The fourth proportional to 351,638.34, 485,904.60 and 255,978.96 is: 353,719.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,638.34 : 485,904.60 = 255,978.96 : x
  2. Step 2: Convert to fraction form
    351,638.34/485,904.60 = 255,978.96/x
  3. Step 3: Cross multiply
    351,638.34x = 485,904.60 × 255,978.96
  4. Step 4: Simplify right side
    351,638.34x = 124,381,354,167.22
  5. Step 5: Solve for x
    x = 124,381,354,167.22/351,638.34
  6. Step 6: Final answer
    x = 353,719.55

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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.