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Finding the Fourth Proportional to 265,635.60, 398,511.72 and 78,661.68

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Solution

The fourth proportional to 265,635.60, 398,511.72 and 78,661.68 is: 118,009.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,635.60 : 398,511.72 = 78,661.68 : x
  2. Step 2: Convert to fraction form
    265,635.60/398,511.72 = 78,661.68/x
  3. Step 3: Cross multiply
    265,635.60x = 398,511.72 × 78,661.68
  4. Step 4: Simplify right side
    265,635.60x = 31,347,601,394.89
  5. Step 5: Solve for x
    x = 31,347,601,394.89/265,635.60
  6. Step 6: Final answer
    x = 118,009.79

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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.