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Finding the Fourth Proportional to 72,811.71, 100,480.14 and 40,980.78

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Solution

The fourth proportional to 72,811.71, 100,480.14 and 40,980.78 is: 56,553.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,811.71 : 100,480.14 = 40,980.78 : x
  2. Step 2: Convert to fraction form
    72,811.71/100,480.14 = 40,980.78/x
  3. Step 3: Cross multiply
    72,811.71x = 100,480.14 × 40,980.78
  4. Step 4: Simplify right side
    72,811.71x = 4,117,754,511.71
  5. Step 5: Solve for x
    x = 4,117,754,511.71/72,811.71
  6. Step 6: Final answer
    x = 56,553.47

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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.