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Finding the Fourth Proportional to 355,419.87, 490,480.40 and 212,176.83

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Solution

The fourth proportional to 355,419.87, 490,480.40 and 212,176.83 is: 292,804.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,419.87 : 490,480.40 = 212,176.83 : x
  2. Step 2: Convert to fraction form
    355,419.87/490,480.40 = 212,176.83/x
  3. Step 3: Cross multiply
    355,419.87x = 490,480.40 × 212,176.83
  4. Step 4: Simplify right side
    355,419.87x = 104,068,576,449.13
  5. Step 5: Solve for x
    x = 104,068,576,449.13/355,419.87
  6. Step 6: Final answer
    x = 292,804.61

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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.