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Finding the Fourth Proportional to 72,405.70, 108,511.35 and 51,604.90

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Solution

The fourth proportional to 72,405.70, 108,511.35 and 51,604.90 is: 77,338.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.70 : 108,511.35 = 51,604.90 : x
  2. Step 2: Convert to fraction form
    72,405.70/108,511.35 = 51,604.90/x
  3. Step 3: Cross multiply
    72,405.70x = 108,511.35 × 51,604.90
  4. Step 4: Simplify right side
    72,405.70x = 5,599,717,365.62
  5. Step 5: Solve for x
    x = 5,599,717,365.62/72,405.70
  6. Step 6: Final answer
    x = 77,338.07

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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.