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Finding the Fourth Proportional to 72,398.80, 108,511.80 and 30,278.80

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Solution

The fourth proportional to 72,398.80, 108,511.80 and 30,278.80 is: 45,382.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,398.80 : 108,511.80 = 30,278.80 : x
  2. Step 2: Convert to fraction form
    72,398.80/108,511.80 = 30,278.80/x
  3. Step 3: Cross multiply
    72,398.80x = 108,511.80 × 30,278.80
  4. Step 4: Simplify right side
    72,398.80x = 3,285,607,089.84
  5. Step 5: Solve for x
    x = 3,285,607,089.84/72,398.80
  6. Step 6: Final answer
    x = 45,382.07

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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.